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 RubioTHE MEMO: Trump takes the fight to Congress Rubio says town halls designed for people to 'heckle and scream' At CPAC, Trump lashes out at media MORE (R-Fla.), Lindsey GrahamLindsey GrahamThe Hill's 12:30 Report Back to the future: Congress should look to past for Fintech going forward CNN to host town hall featuring John McCain, Lindsey Graham MORE (R-S.C.) and Jeff FlakeJeff FlakeFCC's GOP chairman blocks Internet privacy rule Greens launch ads against two GOP senators for Pruitt votes GOP groups ramp up pressure on lawmakers over ObamaCare MORE (R-Ariz.) — were joined by more than 20 other GOP senators in voting to advance the debate. Sen. John McCainJohn McCainFather of slain Navy SEAL wants investigation A stronger NATO for a safer world Drug importation won't save dollars or lives 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 McConnellMitch McConnellGOP grapples with repeal of popular ObamaCare policy New DNC chairman wastes no time going after Trump Dem 2020 hopefuls lead pack in opposing Trump Cabinet picks 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 CornynCornyn: Border wall 'makes absolutely no sense' in some areas Ryan on border: ‘We will get this done’ Ryan tours Mexican border on horseback MORE (Texas), Kelly AyotteKelly AyotteLewandowski saw no evidence of voter fraud in New Hampshire NH governor 'not aware’ of major voter fraud Former NH AG: 'Allegations of voter fraud in NH are baseless' MORE (N.H.), Deb FischerDeb FischerFive takeaways from the Scott Pruitt emails A guide to the committees: Senate GOP considers ways to ‘modernize’ endangered species law MORE (Neb.), Rob PortmanRob PortmanConquering Trump returns to conservative summit ­ObamaCare fix hinges on Medicaid clash in Senate A guide to the committees: Senate MORE (Ohio), John ThuneJohn ThuneYahoo reveals new details about security Conquering Trump returns to conservative summit Low-income consumer broadband credits mean competitiveness, choice and compassion MORE (S.D.), Orrin HatchOrrin HatchHow to marry housing policy and tax reform for millions of Americans Though flawed, complex Medicaid block grants have fighting chance A guide to the committees: Senate MORE (Utah), Jeff Chiesa (N.J.), Roger WickerRoger WickerA guide to the committees: Senate Pruitt confirmation sets stage for Trump EPA assault Price huddles with Senate GOP on ObamaCare MORE (Miss.), Thad CochranThad CochranA guide to the committees: Senate Mulvaney sworn in as White House budget chief Senate confirms Mulvaney to be Trump’s budget chief MORE (Miss.), Pat Toomey (Pa.), Lamar AlexanderLamar AlexanderGOP governors confront Medicaid divide A guide to the committees: Senate Overnight Healthcare: Trump officials weigh fate of birth control mandate | House, DOJ seek delay in ObamaCare lawsuit MORE (Tenn.), John HoevenJohn HoevenA guide to the committees: Senate GOP senators unveil bill to give Congress control of consumer bureau budget Dem senator: DeVos bigger threat to education than grizzlies MORE (N.D.), Richard BurrRichard BurrTop Senate Dem: ‘Grave concerns’ about independence of Russia probe Trump's pick for intel chief to get hearing next week A guide to the committees: Senate MORE (N.C.), Rand PaulRand PaulConquering Trump returns to conservative summit Rand Paul rejects label of 'Trump's most loyal stooge' GOP healthcare plans push health savings account expansion MORE (Ky.), Susan CollinsSusan CollinsLeaked ObamaCare bill would defund Planned Parenthood GOP lawmaker at town hall calls on Trump to release his tax returns GOP senator won't vote to defund Planned Parenthood MORE (Maine), Jerry MoranJerry MoranYahoo reveals new details about security A guide to the committees: Senate Verizon, Yahoo slash merger deal by 0M over data breaches MORE (Kan.), Roy BluntRoy BluntA guide to the committees: Senate Judiciary Committee wants briefing, documents on Flynn resignation Intel Dem: House GOP now open to investigating Flynn MORE (Mo.), Dan CoatsDan CoatsDNI official challenges reports of low morale in intelligence community Trust the states — we'll deliver on healthcare Trump's pick for intel chief to get hearing next week MORE (Ind.), Dean HellerDean HellerCornyn: Border wall 'makes absolutely no sense' in some areas Greens launch ads against two GOP senators for Pruitt votes GOP groups ramp up pressure on lawmakers over ObamaCare MORE (Nev.), Ron JohnsonRon JohnsonA guide to the committees: Senate Hopes rise for law to expand access to experimental drugs Dems ask for hearings on Russian attempts to attack election infrastructure MORE (Wis.), Bob CorkerBob CorkerA guide to the committees: Senate Republicans play clean up on Trump's foreign policy GOP Congress unnerved by Trump bumps MORE (Tenn.), Mike JohannsMike JohannsTo buy a Swiss company, ChemChina must pass through Washington Republican senator vows to block nominees over ObamaCare co-ops Revisiting insurance regulatory reform in a post-crisis world MORE (Neb.), Johnny IsaksonJohnny IsaksonA guide to the committees: Senate GOP rep on Trump: 'God has used imperfect people to do great things before' GOP senators unveil bill to give Congress control of consumer bureau budget MORE (Ga.) and Saxby ChamblissSaxby ChamblissWyden hammers CIA chief over Senate spying Cruz is a liability Inside Paul Ryan’s brain trust 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 ReidSanders and Schumer are right: Ellison for DNC chair The Hill's 12:30 Report Hopes rise for law to expand access to experimental drugs 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 SessionsJeff SessionsIntel, Yahoo join legal brief supporting transgender rights Cotton: Special prosecutor talk is 'getting ahead of ourselves' Dem 2020 hopefuls lead pack in opposing Trump Cabinet picks MORE (R-Ala.), John Cornyn (R-Texas) and Chuck GrassleyChuck GrassleyGOP senator grilled over DeVos vote during town hall Big Pharma must address high drug prices ­ObamaCare fix hinges on Medicaid clash in Senate 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 DurbinDick DurbinDems rip Trump administration for revoking Obama's transgender directive A guide to the committees: Senate McConnell: I’m very sympathetic to 'Dreamers' 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 SchumerDean: Schumer's endorsement 'kiss of death' for Ellison How the candidates for DNC chair stack up ahead of Saturday's vote DNC candidate Harrison drops out, backs Perez for chairman MORE (D-N.Y.), Durbin, Robert MenendezRobert MenendezSteve Mnuchin, foreclosure king, now runs your US Treasury Senate Dems move to nix Trump's deportation order Senators to Trump: We support additional Iran sanctions MORE (D-N.J.) and Michael BennetMichael BennetA guide to the committees: Senate Senate advances Trump's Commerce pick Senate Dems move to nix Trump's deportation order MORE (D-Colo.) are also part of the Gang of Eight.

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