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 RubioHillicon Valley: Supreme Court takes up Apple case | Senate votes to block ZTE deal | Officials testify on Clinton probe report | Russia's threat to undersea cables | Trump tells Pentagon to create 'space force' | FCC begins T-Mobile, Sprint deal review Feehery: Betting on Trump Senate votes to block Trump's ZTE deal MORE (R-Fla.), Lindsey GrahamLindsey Olin GrahamTrump digs in amid uproar on zero tolerance policy Senate passes 6B defense bill Justice IG says report doesn’t assess ‘credibility’ of Russian probe MORE (R-S.C.) and Jeff FlakeJeffrey (Jeff) Lane FlakeSenate chaplain offers prayer 'as children are being separated from their parents' Romney backs Laura Bush on border: 'We need a more compassionate answer' Mark Sanford’s troubles did not begin with Trump MORE (R-Ariz.) — were joined by more than 20 other GOP senators in voting to advance the debate. Sen. John McCainJohn Sidney McCainTrump plan to claw back billion in spending in peril McCain calls on Trump to rescind family separation policy: It's 'an affront to the decency of the American people' Senate passes 6B defense bill 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 McConnellSenate passes 6B defense bill Poll: Kim Jong Un has higher approval among Republicans than Pelosi The Hill's Morning Report — Sponsored by PhRMA — Outcry raises pressure on GOP for immigration fix 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 CornynTrump plan to claw back billion in spending in peril Trump digs in amid uproar on zero tolerance policy Amendments fuel resentments within Senate GOP MORE (Texas), Kelly AyotteKelly Ann AyotteErnst, Fischer to square off for leadership post The Hill's Morning Report: Koch Network re-evaluating midterm strategy amid frustrations with GOP Audit finds US Defense Department wasted hundreds of millions of taxpayer dollars MORE (N.H.), Deb FischerDebra (Deb) Strobel FischerErnst, Fischer to square off for leadership post McConnell will ask Cornyn to stay on GOP leadership team Graham downplays need for bill reining in Trump on tariffs after White House meeting MORE (Neb.), Rob PortmanRobert (Rob) Jones PortmanHarvard biz school honors Wilbur Ross GOP senators blast White House aide over trade remarks Community development impact remains clear with NMTC post-tax reform MORE (Ohio), John ThuneJohn Randolph ThuneTrump plan to claw back billion in spending in peril McConnell: Mueller 'ought to wrap it up' Graham jokes about Corker: GOP would have to be organized to be a cult MORE (S.D.), Orrin HatchOrrin Grant HatchLive coverage: FBI chief, Justice IG testify on critical report On The Money: Trump imposes B in tariffs on China | China blasts 'fickle' Trump, promises payback | Trump to name consumer bureau director next week Trump announces tariffs on billion in Chinese goods MORE (Utah), Jeff Chiesa (N.J.), Roger WickerRoger Frederick WickerGraham jokes about Corker: GOP would have to be organized to be a cult Lawmakers, media serve up laughs at annual 'Will on the Hill' McConnell will ask Cornyn to stay on GOP leadership team MORE (Miss.), Thad CochranWilliam (Thad) Thad CochranTodd Young in talks about chairing Senate GOP campaign arm US farming cannot afford to continue to fall behind Mississippi Democrat drops Senate bid MORE (Miss.), Pat Toomey (Pa.), Lamar AlexanderAndrew (Lamar) Lamar AlexanderIBM-led coalition pushes senators for action on better tech skills training Dems seek to leverage ObamaCare fight for midterms GOP senator: DOJ's ObamaCare argument 'as far-fetched as any I've ever heard' MORE (Tenn.), John HoevenJohn Henry HoevenGOP senators want NAFTA deal from Trump by Labor Day Senate GOP urges Trump administration to work closely with Congress on NAFTA GOP lawmakers want Trump to stop bashing Congress MORE (N.D.), Richard BurrRichard Mauze BurrFormer Senate intel aide indicted for perjury makes first court appearance The Hill's Morning Report — Sponsored by PhRMA — Washington's week of 'we'll see' Former Senate Intel aide indicted in DOJ leak case MORE (N.C.), Rand PaulRandal (Rand) Howard PaulSenate passes 6B defense bill This week: House GOP caught in immigration limbo Amendments fuel resentments within Senate GOP MORE (Ky.), Susan CollinsSusan Margaret CollinsTrump plan to claw back billion in spending in peril Romney backs Laura Bush on border: 'We need a more compassionate answer' Amnesty International rips family separation policy: 'This is nothing short of torture' MORE (Maine), Jerry MoranGerald (Jerry) MoranFormer USA Gymnastics CEO pleads Fifth at hearing GOP, Trump at odds on pardon power Lawmakers request meeting with Amtrak CEO over funding for route MORE (Kan.), Roy BluntRoy Dean BluntErnst, Fischer to square off for leadership post Facebook gives 500 pages of answers to lawmakers' data privacy questions Community development impact remains clear with NMTC post-tax reform MORE (Mo.), Dan CoatsDaniel (Dan) Ray CoatsGOP senator places hold on Trump counterintelligence nominee Civil liberties groups press Trump administration on NSA call record collection Trump’s ‘Syraqistan’ strategy is a success — and a failure MORE (Ind.), Dean HellerDean Arthur Heller20 weeks out from midterms, Dems and GOP brace for surprises Trump to attend fundraiser for Heller Dems seek to seize on data privacy as midterm issue MORE (Nev.), Ron JohnsonRonald (Ron) Harold JohnsonSenate probes FBI's heavy-handed use of redactions to obstruct congressional investigators Hillicon Valley: DHS gets new cyber chief | White House warns lawmakers not to block ZTE deal | White nationalists find home on Google Plus | Comcast outbids Disney for Fox | Anticipation builds for report on FBI Clinton probe Graham jokes about Corker: GOP would have to be organized to be a cult MORE (Wis.), Bob CorkerRobert (Bob) Phillips CorkerSenate chaplain offers prayer 'as children are being separated from their parents' Senate passes 6B defense bill This week: House GOP caught in immigration limbo 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 IsaksonOvernight Finance: Senators introduce bill to curb Trump's tariff authority | McConnell calls it 'exercise in futility' | Kudlow warns WTO won't dictate policy | Mulvaney feud with consumer advocates deepens Senators introduce bill to curb Trump's tariff authority Trump VA pick boosts hopes for reform MORE (Ga.) and Saxby ChamblissClarence (Saxby) Saxby ChamblissLobbying World Former GOP senator: Let Dems engage on healthcare bill OPINION: Left-wing politics will be the demise of the Democratic Party 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 ReidAmendments fuel resentments within Senate GOP Donald Trump is delivering on his promises and voters are noticing Danny Tarkanian wins Nevada GOP congressional 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 SessionsSessions responds to Nazi comparisons: 'They were keeping the Jews from leaving' Laura Ingraham: Migrant child detention centers 'essentially summer camps' Senate chaplain offers prayer 'as children are being separated from their parents' MORE (R-Ala.), John Cornyn (R-Texas) and Chuck GrassleyCharles (Chuck) Ernest GrassleyJustice IG says report doesn’t assess ‘credibility’ of Russian probe DOJ watchdog probing Comey's memos, will release another report Grassley demands details on Comey's use of personal email 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 DurbinLive coverage: FBI chief, Justice IG testify on critical report Hugh Hewitt to Trump: 'It is 100 percent wrong to separate border-crossing families' Opioid treatment plans must include a trauma-informed approach 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 SchumerDems must stop picking foxes to guard the financial hen house Schumer warns 'House moderates' against immigration compromise bill Trump knocks Schumer, touts North Korea summit in early morning tweet MORE (D-N.Y.), Durbin, Robert MenendezRobert (Bob) MenendezSchumer: Obama 'very amenable' to helping Senate Dems in midterms The Hill's Morning Report: Can Trump close the deal with North Korea? Senate must save itself by confirming Mike Pompeo MORE (D-N.J.) and Michael BennetMichael Farrand BennetOvernight Finance: Trump wants Russia back in G-7 | Senators, allies push back | House approves first fiscal 2019 spending bills | Dems want insider trading probe over job tweet Dems want insider trading probe after Trump jobs report tweet Clinton on his reading habits: 'I like a fast ride' MORE (D-Colo.) are also part of the Gang of Eight.

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