The Senate voted 82-15 on Tuesday to end debate on a motion to proceed to a comprehensive immigration reform bill.

Senators are expected to vote in an hour to proceed to the bill, which will launch a weeks-long floor debate on immigration reform.

Three of the four Republican members of the Gang of Eight — Sens. Marco RubioMarco Antonio RubioAnother VPOTUS tries for POTUS: What does history tell us? Tensions swirl around Iran as administration to brief Congress Tensions swirl around Iran as administration to brief Congress MORE (R-Fla.), Lindsey GrahamLindsey Olin GrahamCongress, White House near deal on spending, debt limit Hillicon Valley: Google delays cutting off Huawei | GOP senators split over breaking up big tech | Report finds DNC lagging behind RNC on cybersecurity Roger Stone considers suing to discover if he was spied on by FBI MORE (R-S.C.) and Jeff FlakeJeffrey (Jeff) Lane FlakeThe Hill's Morning Report - White House, Congress: Urgency of now around budget Jeff Daniels blasts 'cowardice' of Senate Republicans against Trump WANTED: A Republican with courage MORE (R-Ariz.) — were joined by more than 20 other GOP senators in voting to advance the debate. Sen. John McCainJohn Sidney McCainPelosi receives John F. Kennedy Profile in Courage Award Romney: Trump 'has distanced himself from some of the best qualities of the human character' MSNBC host: Barr 'the most dangerous person' who works for Trump MORE (R-Ariz.) supports the measure, but missed the vote. That strong support is expected to dwindle if certain amendments aren't agreed to.

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"As an elected leader in my party, it’s my view that we at least need to try to improve a situation that, as far as I can tell, very few people believe is working well either for our own citizens, or for those around the world who aspire to become Americans," Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellThe Hill's Morning Report - Pelosi remains firm despite new impeachment push Iraq War looms over Trump battle with Iran 2020 Dems break political taboos by endorsing litmus tests MORE (R-Ky.) said ahead of the vote Tuesday. "I’ll vote to debate it and for the opportunity to amend it, but in the days ahead, there will need to be major changes to this bill if it’s going to become law."

McConnell and Sens. John CornynJohn CornynCollins offering bill to boost battery research as GOP pushes energy 'innovation' Hillicon Valley: Google delays cutting off Huawei | GOP senators split over breaking up big tech | Report finds DNC lagging behind RNC on cybersecurity Trump officials say US efforts to deter Iran have worked MORE (Texas), Kelly AyotteKelly Ann AyotteSinema, Gallagher fastest lawmakers in charity race New Hampshire senator to ask 2020 Dems to back repeal of state residency law Schultz recruiting GOP insiders ahead of possible 2020 bid MORE (N.H.), Deb FischerDebra (Deb) Strobel FischerCongress readies for battle over nuclear policy Trump's pursuit of infrastructure deal hits GOP roadblock Why America needs the ability to track enemy missiles from space MORE (Neb.), Rob PortmanRobert (Rob) Jones PortmanThe Hill's Morning Report - White House, Congress: Urgency of now around budget WANTED: A Republican with courage Companies warn Trump trade war is about to hit consumers MORE (Ohio), John ThuneJohn Randolph ThuneOn The Money: Congress, White House aim to include debt limit increase in spending deal | McConnell optimistic budget deal near | Carson defends HUD eviction plan | Senate votes to undo tax hike on Gold Star families Congress, White House indicate debt limit increase will be part of spending deal Hillicon Valley: Trump takes flak for not joining anti-extremism pact | Phone carriers largely end sharing of location data | Huawei pushes back on ban | Florida lawmakers demand to learn counties hacked by Russians | Feds bust 0M cybercrime group MORE (S.D.), Orrin HatchOrrin Grant HatchTrump gambles in push for drug import proposal Biden's role in Anita Hill hearings defended by witness not allowed to testify 'Congress' worst tax idea ever'? Hardly. MORE (Utah), Jeff Chiesa (N.J.), Roger WickerRoger Frederick WickerMomentum grows to create 'Do Not Track' registry Senate Republicans running away from Alabama abortion law Hillicon Valley: Trump takes flak for not joining anti-extremism pact | Phone carriers largely end sharing of location data | Huawei pushes back on ban | Florida lawmakers demand to learn counties hacked by Russians | Feds bust 0M cybercrime group MORE (Miss.), Thad CochranWilliam (Thad) Thad CochranTop 5 races to watch in 2019 Bottom Line Races Dems narrowly lost show party needs to return to Howard Dean’s 50 state strategy MORE (Miss.), Pat Toomey (Pa.), Lamar AlexanderAndrew (Lamar) Lamar AlexanderCollins offering bill to boost battery research as GOP pushes energy 'innovation' Senate chairman says bipartisan health care package coming Thursday It's time for Republicans to lead (again) on climate MORE (Tenn.), John HoevenJohn Henry HoevenSenators introduce bill to prevent border agency from selling personal data Overnight Energy: Bipartisan Senate group seeks more funding for carbon capture technology | Dems want documents on Interior pick's lobbying work | Officials push to produce more electric vehicle batteries in US Officials, automakers aim to produce more electric vehicle batteries in US: report MORE (N.D.), Richard BurrRichard Mauze BurrOvernight Defense: Congressional leaders receive classified briefing on Iran | Trump on war: 'I hope not' | Key Republican calls threats credible | Warren plan targets corporate influence at Pentagon Key Republican 'convinced' Iran threats are credible Congressional leaders receive classified Iran briefing MORE (N.C.), Rand PaulRandal (Rand) Howard PaulGOP presses Trump to make a deal on spending House Freedom Caucus votes to condemn Amash's impeachment comments Bolton emerges as flashpoint in GOP debate on Iran MORE (Ky.), Susan CollinsSusan Margaret CollinsCollins offering bill to boost battery research as GOP pushes energy 'innovation' Biden says Congress must move to protect abortion rights Women's civil rights are not a state issue MORE (Maine), Jerry MoranGerald (Jerry) MoranOn The Money: Judge upholds House subpoena for Trump financial records | Trump vows to appeal ruling by 'Obama-appointed judge' | Canada, Mexico lift retaliatory tariffs on US | IRS audit rate falls GOP senator calls for resolution of trade dispute: 'Farmers and ranchers are hurting' Frustrated GOP senators want answers from Trump on Iran MORE (Kan.), Roy BluntRoy Dean BluntHillicon Valley: Trump takes flak for not joining anti-extremism pact | Phone carriers largely end sharing of location data | Huawei pushes back on ban | Florida lawmakers demand to learn counties hacked by Russians | Feds bust 0M cybercrime group Top Republican says Senate unlikely to vote on any election security bills San Francisco becomes first city to ban facial recognition technology MORE (Mo.), Dan CoatsDaniel (Dan) Ray CoatsHillicon Valley: Facebook co-founder calls for breaking up company | Facebook pushes back | Experts study 2020 candidates to offset 'deepfake' threat | FCC votes to block China Mobile | Groups, lawmakers accuse Amazon of violating children's privacy Experts are studying mannerisms of 2020 candidates to help offset threat of 'deepfake' videos Bolton held unexpected meeting on Iran with top intel, military advisers at CIA: report MORE (Ind.), Dean HellerDean Arthur HellerThis week: Barr back in hot seat over Mueller report Trump suggests Heller lost reelection bid because he was 'hostile' during 2016 presidential campaign Trump picks ex-oil lobbyist David Bernhardt for Interior secretary MORE (Nev.), Ron JohnsonRonald (Ron) Harold JohnsonBarr throws curveball into Senate GOP 'spying' probe Bipartisan group of senators introduce legislation designed to strengthen cybersecurity of voting systems Trump Jr. subpoena spotlights GOP split over Russia probes MORE (Wis.), Bob CorkerRobert (Bob) Phillips CorkerJeff Daniels blasts 'cowardice' of Senate Republicans against Trump Corker: 'I just don't' see path to challenge Trump in 2020 Ex-GOP Sen. Corker: Trump primary would be 'good thing for our country' MORE (Tenn.), Mike JohannsMichael (Mike) Owen JohannsMeet the Democratic sleeper candidate gunning for Senate in Nebraska Farmers, tax incentives can ease the pain of a smaller farm bill Lobbying World MORE (Neb.), Johnny IsaksonJohn (Johnny) Hardy IsaksonSenators say they've reached deal on Puerto Rico aid Klobuchar: Trump plan doesn't deal with 'comprehensive immigration issue' Pence, McConnell eulogize Sen. Richard Lugar MORE (Ga.) and Saxby ChamblissClarence (Saxby) Saxby ChamblissRepublicans say Democrats holding up disaster relief as 'Sandy payback' Ex-House Intel chair: Intel panel is wrong forum to investigate Trump's finances The Hill's Morning Report - Trump budget reignites border security fight MORE (Ga.) were the Republicans who voted to advance the bill.

The bipartisan group of eight senators, known as the Gang of Eight, introduced S. 744, which would create a pathway to citizenship for illegal immigrants already in the country, toughen border security, create a guest worker program and boost high-skilled immigration.

“There are 11 million reasons to pass common-sense immigration reform that mends our broken system — 11 million stories of heartbreak and suffering that should motivate Congress to act,” Senate Majority Leader Harry ReidHarry Mason ReidLobbying World Mitch McConnell is not invincible Seven big decisions facing Biden in 2020 primary MORE (D-Nev.) said Tuesday. “The bipartisan proposal before the Senate takes important steps to strengthen border security. It also makes crucial improvements to our broken legal immigration system.”

Democrats have praised part of the bill that would grant citizenship to young people, known as Dreamers, who were brought to the country by their parents without legal documentation.

But some Republicans have complained that the legislation would provide amnesty over 10 years for the nearly 11 million residents in the country illegally before strengthening border enforcement. 

The bill makes permanent legal residence contingent on the Department of Homeland Security (DHS) having 100 percent situational awareness at every segment of the southern border and a 90 percent apprehension rate. But some GOP senators have suggested that the bill gives DHS too much say over whether the border is secure, leaving Congress powerless to stop the amnesty program if security measures aren’t met.

Sens. Jeff SessionsJefferson (Jeff) Beauregard SessionsHouse Democrats leave empty chair for McGahn at hearing MSNBC host: Barr 'the most dangerous person' who works for Trump Chris Wallace: AG Barr 'clearly is protecting' Trump MORE (R-Ala.), John Cornyn (R-Texas) and Chuck GrassleyCharles (Chuck) Ernest GrassleyTrump mulling visit to ethanol refinery later this month: report Nursing home care: A growing crisis for an aging America  Senate chairman says bipartisan health care package coming Thursday MORE (R-Iowa) have said the bill is similar to the last immigration reform measure in 1986 because it “legalizes first and enforces later.”

“In other words the federal government has always said the right things to the American people, but it has never lived up to its promises,” Cornyn said Tuesday. “This is doable, but we need a leverage to compel the bureaucracy and Congress to get the result the American people want.”

Sessions added that because of the way the legislation is written, he believes Gang of Eight members aren’t really serious about border security.

Sens. Dick DurbinRichard (Dick) Joseph DurbinIraq War looms over Trump battle with Iran Muslim lawmakers host Ramadan iftar to break fast at Capitol Let's stop treating student borrowers like second-class citizens MORE (D-Ill.) and Marco Rubio (R-Fla.) argued that wasn’t true, pointing out that the bill authorizes more funding for border security and fencing. 

“I know it’s hard to do, but I refuse to accept the idea that the most power country in the world — the country that put a man on the moon — is incapable of securing our border,” Rubio said.

Democratic Sens. Charles SchumerCharles (Chuck) Ellis SchumerSchumer wants investigation into Chinese-designed New York subway cars Getting serious about infrastructure Schumer calls on McConnell to hold vote on Equality Act MORE (D-N.Y.), Durbin, Robert MenendezRobert (Bob) MenendezEnding the Cyprus arms embargo will increase tensions in the Eastern Mediterranean We can accelerate a cure for Alzheimer's The Hill's 12:30 Report: Manafort sentenced to total of 7.5 years in prison MORE (D-N.J.) and Michael BennetMichael Farrand BennetThe Hill's Morning Report - White House, Congress: Urgency of now around budget Overnight Energy: Warren wants Dems to hold climate-focused debate | Klobuchar joins candidates rejecting fossil fuel money | 2020 contender Bennet offers climate plan CNN announces four more town halls featuring 2020 Dems MORE (D-Colo.) are also part of the Gang of Eight.

This story was updated at 3:28 p.m.