WASHINGTON The Senate reached a deal Monday to fund the government and potentially provide a path forward for a larger immigration agreement. The House passed the deal later on Monday, and President Donald Trump signed the bill that same evening, effectively ending the shutdown.

Senators voted 81-18 for a three-week funding measure to reopen the government, with many Democrats saying they felt encouraged by Senate Majority Leader Mitch McConnells (R-Ky.) assurance over the weekend that the Senate would proceed to an immigration bill soon.

Democrats insisted they werent caving, even though they didnt get what they wanted: an immediate vote on protections for undocumented young people often called Dreamers. But the deal gave them a way out of what could have been a politically damaging shutdown. The promise of a vote on the Deferred Action for Childhood Arrivals program, although it could be reneged on, is something Democrats didnt have before. Its the first time Democrats received a firm deadline for a vote on an immigration bill. And if McConnell doesnt follow through, Democrats will be able to use this promise to vote against the next spending bill and pin the blame on Republicans .

If McConnell keeps his word, hell put Speaker Paul Ryan (R-Wis.) in a tough spot. There is a DACA bill currently working its way through the House that would deliver on a number of conservative immigration priorities, but it has no chance in the Senate.

If senators are able to pass their own bill, while simultaneously demonstrating that the House bill doesnt have the votes to pass in their chamber, Ryan will be left with the choice of either putting the Senate bill up for a vote and angering conservatives or holding strong. If he holds strong and doesnt put the Senate-passed measure up for a vote, he could risk another shutdown and strengthen the Democrats argument that another government closure is the fault of Republican obstructionism.

I dont think I can guarantee a House outcome but I think the stronger the bill, in terms of the strength of the bipartisanship in the bill the odds go up in the House, Sen. Tim Kaine (D-Va.) told HuffPost.

For now, Democrats were happy to end a government shutdown, fund the Childrens Health Insurance Program for six years, and functionally not give up any of their leverage.

Although CHIP had bipartisan support, Congress had failed to renew it. Part of the reason is that there were disagreements over how to pay for it, with some GOP proposals undercutting Obamacare in the process.

McConnell reiterated Monday morning that he would move to vote on an immigration bill if the two sides cant agree to one by Feb. 8, as long as the government is still fully open.

It would be my intention to take up legislation here in the Senate that would address DACA, border security, and related issues as well as disaster relief, defense funding, health care, and other important matters, McConnell said. It would be my strong preference for the Senate to consider a proposal that can actually be signed into law, a bipartisan, bicameral group is already negotiating, and I look forward to completion of its work.

Some Democrats took McConnells remarks as a step toward their preferred solution. Sen. Bill Nelson (D-Fla.) said it represented a path forward that is enormously smoother.

I believe Sen. McConnell will follow through, independent Sen. Angus King of Maine, who caucuses with the Democrats, told reporters Monday. I think hes made his commitments so publicly and so unequivocally, particularly this morning which was a stronger statement than last night itd be very difficult for him to try to find a way out of meeting that commitment.

Sen. Kamala Harris (D-Calif.), however, was not convinced by McConnells assurances that he would hold a vote on an immigration bill in the future.

I dont believe he made any commitment whatsoever and I think it would be foolhardy to believe that he made a commitment, Harris said.

The federal government has been shut down since early Saturday because the Senate didnt approve a deal on the four-week spending bill needed to keep it open. Forty-four Democrats and four Republicans voted against that bill , with many saying they wouldnt support anything that didnt help the 700,000 undocumented young people Trump put at risk of losing deportation protections when he ended DACA . Other lawmakers who voted no said short-term spending bills are a bad way to operate the government.

Immigrant rights groups have been urging Democrats to demand Dreamer relief as part of must-pass spending bills since Trump rescinded DACA. Their logic based on years of experience is that a standalone bill to help Dreamers will languish if its not attached to another measure because Republican leaders wont give it a vote, even if it has the support to pass.

McConnells promise convinced some Democrats to switch their vote. But he wasnt able to make any guarantees about the House, as Ryan previously promised the conservative Freedom Caucus he would not hold immigration votes without support from a majority of the Republican conference.

Trump could also throw the entire deal into disarray. He rejected an offer from Senate Minority Leader Chuck Schumer (D-N.Y.) on Friday to fund a border wall something Democrats have said they would not accept in exchange for Dreamer protections, according to Schumer. Since the shutdown, White House officials have said they would not negotiate on immigration issues.

In a speech on the Senate floor announcing that his caucus would vote to move forward, Schumer said he hadnt spoken with Trump since their Friday meeting at the White House before the government shut down. The great deal-making president sat on the sidelines, he said.

Dreamer activists called on Democrats earlier Monday to not settle for McConnells promise to hold a vote. If they lose DACA as an estimated 122 Dreamers already are each day they will lose work permits and could be deported.

Promises wont protect anyone from deportation because delay means deportations for us, Greisa Martinez Rosas, advocacy director for the Dreamer-led group United We Dream, said on a call with reporters ahead of the vote.

The Democratic senators who voted against the measure were: Richard Blumenthal (Conn.), Cory Booker (N.J.), Catherine Cortez Masto (Nev.), Dianne Feinstein (Calif.), Kirsten Gillibrand (N.Y.), Kamala Harris (Calif.), Mazie Hirono (Hawaii), Patrick Leahy (Vt.), Ed Markey (Mass.), Robert Menendez (N.J.), Jeff Merkley (Ore.), Chris Murphy (Conn.), Bernie Sanders (Vt.), Jon Tester (Mont.), Elizabeth Warren (Mass.) and Ron Wyden (Ore.).

On the Republican side, Sens. Mike Lee (Utah) and Rand Paul (Ky.) also voted against it.

Amanda Terkel contributed reporting.

This story has been updated with vote counts, additional quotes and news of Donald Trumps signature.