The Senate is aiming to finish its work on a mammoth annual defense bill before leaving Washington mid-week.

The House left town on Thursday until the 25th. Senators are scheduled to be in session through Wednesday, before taking a two-day state work period for Rosh Hashana.

But before then leadership wants to wrap up the National Defense Authorization Act (NDAA), after a fight over amendments forced lawmakers to end debate and run out the clock.

More than 400 amendments were filed to the legislation—which lays out broad guidelines on foreign policy and for the Pentagon—with roughly 100, so far, worked into the bill by unanimous consent.

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But a back-and-forth over votes on some senators' more controversial amendments brought debate on the bill to a standstill, with Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) moving to wrap up debate late last week.

Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.), the chairman of the Armed Services Committee, said the disagreement circled around four amendments: one from Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) barring indefinite detention, one from Sen. Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (D-Wis.) tightening "Buy American" requirements for the Pentagon, one from Sen. Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (D-Ill.) stripping limitations on medical research funded by the Pentagon, and one from Sen. Tom Cotton Tom Bryant CottonRenewed focus on Trump's Supreme Court list after Ginsburg's death Republicans call for DOJ to prosecute Netflix executives for releasing 'Cuties' Loeffler calls for hearing in wake of Netflix's 'Cuties' MORE (R-Ark.) repealing enforcement of spending caps.

"I must say that we're at an impasse on about four amendments, all four of which are important amendments, and we simply can't get an agreement," McCain said late last week.

That means an amendment from Sens. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) and Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) blocking Trump's ban on transgender troops won’t get a vote. Instead, the two senators joined with McCain and Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.), the ranking member of the Armed Services Committee, to introduce a stand-alone bill.

It’s a familiar predicament for the NDAA. Though it normally clears the Senate by a large bipartisan margin its status as a must-pass bill makes it a lightening rod for other proposals.

The push toward wrapping up the bill comes after Sen. Rand Paul (R-Ky.) threatened to slow-walk the defense bill and block any other amendments from getting a vote until the Senate voted on his proposal to sunset two war authorizations. Senators shot down that measure Wednesday in a 61-36 vote.

The Senate is expected to finish the NDAA on Monday night. A final procedural vote is scheduled at 5:30 p.m., where the bill will need, and is expected to easily get, 60 votes. Lawmakers will then immediately move to final passage.

Once the legislation passes the upper chamber, senators will need to head to conference with the House to merge their two versions of the bill. Two potential areas of conflict include a fight over funding levels and whether or not Congress should back creating a new military branch dedicated to space, called the Space Corps.

Nominations

The Senate is also expected to take up Trump’s pick for the No. 3 spot at the Justice Department.

Senators, absent an agreement, are scheduled to take up an initial vote on Noel Francisco’s nomination to be solicitor general on Tuesday morning.

The role would bring him before the Supreme Court to argue on behalf of the government.

Francisco—whose background largely leans toward Republicans—formally practiced law at Jones Day, including successfully defending former Virginia Gov. Bob McDonnell (R) in his corruption case.

He also represented religious nonprofits seeking exemption from a provision in ObamaCare that required employers to pay for contraception coverage.

Francisco advanced out of the Judiciary Committee in June on a party-line 11-9 vote.

Senate Majority Leader Mitch McConnell (R-Ky.) and Minority Leader Chuck Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-N.Y.) could be overheard joking about his nomination as part of Senate floor conversation picked up on a hot mic late last week.

Schumer, told that Francisco clerked for the late Supreme Court Justice Antonin Scalia, asked “do we nominate anyone who's not a Scalia or Thomas clerk for anything?"

"I hope not. I hope not. That's the game plan,” McConnell quickly quipped in response, to laugher.