The Capitol is seen in Washington, Friday, April 7, 2017, as the Senate confirmed President Donald Trump's Supreme Court nominee Neil Gorsuch. The Republican health care bill remains in shambles and budget chores remain as lawmakers in the Senate and the House headed home for a two-week recess.   (AP Photo/J. Scott Applewhite)
The Capitol is seen in Washington, Friday, April 7, 2017, as the Senate confirmed President Donald Trump's Supreme Court nominee Neil Gorsuch. The Republican health care bill remains in shambles and budget chores remain as lawmakers in the Senate and the House headed home for a two-week recess. (AP Photo/J. Scott Applewhite) Credit: J. Scott Applewhite

Members of Congress are back home for a two-week recess after one of the most bitterly divided and least productive starts in recent history. A new, urgent challenge is waiting for them when they return: finding a way to set aside their anger and mistrust long enough to keep the federal government open.

Government funding expires on April 28, which will give Congress five days to unveil, debate and pass an enormous spending bill, or trigger a government shutdown.

Republicans control both chambers of Congress and the White House, yet their sole legislative accomplishments are a few measures reversing obscure regulations implemented in the closing months of Barack Obamaโ€™s presidency.

The health care debate has been particularly painful and embarrassing for Republicans. After passing dozens of repeal bills that were never going to be enacted under Obama, they couldnโ€™t quite unify on a plan that could actually become law under Trump.

House Republicans โ€œhave differences of opinion. And they arenโ€™t just political differences, they are policy differences,โ€ said Republican Sen. Rob Portman of Ohio. โ€œTheyโ€™re going to have a tough time coming together without some Democratic votes, and I think thatโ€™s the acknowledgment.โ€

Republicans and Trump have yet to try to engage Democrats on health care, or other significant legislative priorities. Confirmation of Trumpโ€™s Supreme Court nominee came only after Republicans changed Senate rules to overcome Democratic opposition.

The only exception has been that through all the partisan rancor, a bipartisan group of lawmakers has been quietly negotiating an omnibus spending bill that would fund the government through the end of the fiscal year on Sept. 30.

Nobody has seen the result yet, which leaves conservatives deeply suspicious about why their partyโ€™s leaders are waiting so long to unveil the legislation.

โ€œItโ€™s like a florist being surprised by Valentineโ€™s Day,โ€ said Mark Meadows of North Carolina, chairman of the conservative House Freedom Caucus. โ€œI donโ€™t get it.โ€

Democrats involved in the talks say the process has been fair and productive, and Republican leaders are praising the chances for bipartisanship.

โ€œThese kinds of bills canโ€™t pass without a reasonable number of the party of the minority in the Senate,โ€ Senate Majority Leader Mitch McConnell said Friday. โ€œAnd we are optimistic weโ€™ll be able to work all that out and meet the deadline at the end of the month.โ€ Any spending measure needs at least eight Democratic votes in the Senate to be enacted.

But there are several wild cards that could derail things, the biggest one being Trump. The president wants Congress to begin spending money on a border wall โ€“ his signature campaign promise โ€“ even though Democrats are mostly opposed and Republican leaders are in no hurry.

The White House wonโ€™t say whether Trump will threaten to veto the spending bill if the border money isnโ€™t included. Trump has asked Congress for $33 billion in extra defense and border wall funding, paired with $18 billion in cuts to domestic programs.

Republicans have rejected the domestic cuts, but itโ€™s unclear how the wall funding will be handled.

โ€œThe only thing that could derail that progress is the White House insisting on their extraneous demands, which would meet bipartisan opposition,โ€ said Matt House, a spokesman for Senate Minority Leader Chuck Schumer.

House Minority Leader Nancy Pelosi warned Thursday that including funding for the border wall will almost certainly cause a loss of Democratic support. โ€œI would hope that they wouldnโ€™t try that,โ€ she said, adding, โ€œthe American people donโ€™t even support it.โ€

Conservatives, however, are expecting to see some of Trumpโ€™s priorities reflected in the measure, something that Democrats are unlikely to go along with.

โ€œI think that what you will see, youโ€™ll see funding in there for the wall, I think you will see funding in there for better enforcement of sanctuary cities, and I think you will see a plus-up on military,โ€ Meadows predicted. โ€œI think that most people will vote for that, it will go to the Senate, it will get stripped out and then we will have a hard decision to be made in four days.โ€

Other Republicans say itโ€™s time for the GOP to show it can govern.

In the House, passing a spending bill for the remainder of fiscal 2017 was always going to be a challenge. Fiscal conservatives regularly bolt on any spending omnibus, and House Republicans have had to rely on some Democratic votes consistently since taking over the majority in 2011.

In some ways, this crisis too was self-inflicted. The fight could have been avoided in December had the incoming administration not instructed Congress to hold off on passing a bipartisan spending measure in order to give it a chance to weigh in.

Now lawmakers are waiting to see how hard, if at all, the administration will fight for its priorities.

โ€œI think itโ€™s helpful to keep in mind that these failures donโ€™t stem from bad motives or incompetence by Congress members,โ€ said Marjorie Hershey, a political scientist at Indiana University Bloomington. โ€œThey stem from genuine division in the country. It may be intensified in Congress because the loudest voices in their constituencies are usually the most highly partisan and the most extreme.โ€

Beyond keeping government funded and running later this month, Republicans and Trump are eyeing other ambitious legislative goals โ€“ including a tax overhaul, infrastructure spending, and legislation to raise the nationโ€™s debt limit.

McConnell and House Speaker Paul Ryan also have to decide whether to adopt a new fiscal 2018 budget resolution, which could be a difficult feat given conservativesโ€™ demands that the budget needs to be balanced within 10 years.

The darkest cloud over bipartisanship may be the detonation Thursday by Senate Republicans of the โ€œnuclear option,โ€ which enabled them to get around Democratic efforts to block Neil Gorsuchโ€™s nomination to the Supreme Court. The consequences of that decision, allowing Gorsuch to be confirmed Friday, will likely impact the Senate for years.

โ€œI think theyโ€™re throwing a monkey wrench in the gears of bipartisanship and itโ€™s going to make a tough situation even worse in the United States Senate,โ€ Democratic Senator Chris Van Hollen of Maryland said. โ€œWhen theyโ€™re blowing up rules, weโ€™ve got to figure out how we best use the rules that remain.โ€