WASHINGTON - The Senate’s Republican and Democratic leaders unveiled a sweeping two-year budget agreement on Wednesday that would increase federal spending by hundreds of billions of dollars on domestic and defense programs alike.

That deal would nix strict budget caps, set in 2011 to reduce the federal deficit, and would allow Congress to spend billions of dollars more in the current fiscal year and in fiscal year 2019.

The fate of the deal remained uncertain Wednesday, with House conservatives expressing concerns about busting the budget caps and House Democrats saying the agreement did not do enough to protect young undocumented immigrants.

The agreement repeals spending cuts that were scheduled to hit defense and domestic programs this fiscal year and next year.

In addition, Democrats won an additional $57 billion over two years in new funding for domestic programs—$26 billion for the remainder of this fiscal year, which began Oct. 1, and $31 billion for fiscal year 2019.

The congressional aide said $20 billion of that new money would go toward infrastructure initiatives, funding everything from water and sewer improvements to rural broadband expansion and bridge repairs.

Here are other details about how the domestic funds would be divvied up:

-$6 billion would go to fight the opioid epidemic and fund mental health initiatives

-$4 billion would be allocated to repair and rebuild veterans’ health clinics

-$2 billion would go to fund medical research at the National Institutes of Health

Details of the defense spending increases were not immediately available.

House Democratic Leader Nancy Pelosi, D-Calif., said Wednesday she would oppose the bipartisan budget agreement because it does not include protections for undocumented immigrants who came to the U.S. as children. 

Pelosi, D-Calif., said in a statement that the budget agreement being negotiated by Senate Majority Republican Mitch McConnell and Democratic Leader Chuck Schumer includes many important Democratic priorities, including disaster aid and "dollar for dollar increases" in both defense and domestic spending. 

“There will be billions in funding to fight opioids, to strengthen our veterans and the (National Institutes of Health), to build job-creating rural infrastructure and broadband, and to fund access to child care and quality higher education," Pelosi said.

But, she added, "the package does nothing to advance bipartisan legislation to protect DREAMers in the House," referring to the young undocumented immigrants. "Without a commitment from Speaker Ryan comparable to the commitment from Leader McConnell, this package does not have my support.”

Pelosi followed her surprise statement with a dramatic and lengthy speech on the House floor, where she read heart-tugging stories of DREAMers aspiring to become U.S. citizens while calling on Ryan to guarantee a vote for a long-term legislative solution for their status.

Pelosi used her unlimited, "magic" minute, available in the House to only to party leaders, to speak for two hours and counting, including remarks about the Declaration of Independence, the country's founders. At one point, she suggested lawmakers should "just pray all day."

"Maybe I should bring my rosary, blessed by the Pope," said Pelosi, who is Catholic.

AshLee Strong, a spokeswoman for Ryan, said the speaker will only bring up an immigration bill that President Trump supports. 

“Speaker Ryan has already repeatedly stated we intend to do a DACA and immigration reform bill – one that the president supports,” Strong said in an email to USA TODAY. 

DACA is the Obama-era program that shields those immigrants from deportation. Trump has said he plans to kill DACA next month. But Trump has sent dramatically conflicting signals about what kind of immigration bill he would support.

McConnell has promised Democrats he would allow a free-flowing Senate debate on immigration by Feb. 8 and that he would not try to influence the outcome.

Strong did not answer a question about whether Ryan supports the broader budget deal agreed to by the Senate leaders. 

Lawmakers face an imminent deadline. Current federal funding runs out at midnight on Thursday, and if Congress does not pass a new spending bill, it will trigger a partial government shutdown. 

The House on Tuesday passed its fifth stop-gap spending bill, a proposal that would fund domestic programs through March 23 and also give the Pentagon a full-year budget of $659 billion. Pelosi and other Democrats blasted that GOP proposal as a ruse to slash funding for domestic programs. 

The bill is unlikely to pass the Senate, where Democrats are hoping to amend it with the McConnell-Schumer deal and send it back to the House. It is not clear whether the Senate package will have enough support to pass in the Republican-led House.

Conservative Republicans may oppose the agreement because of the increased domestic spending. The would mean Speaker Paul Ryan would need Democrats to support the package; If other House Democrats follow Pelosi's lead, it would be doomed.

Rep.  Mark Meadows, R-N.C., who chairs the hard-line House Freedom Caucus, wants to see what comes back from the Senate, said his spokesman Ben Williamson.

“But if the numbers are as high as we’re hearing, Rep. Meadows does not support the budget deal,” Williamson said.

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