The Senate is angling to take a key test vote as early as Sunday night on a plan that would reopen the government. 

The vote would be a big test to gauge whether enough Democrats would vote with Republicans to break the impasse even though they wouldn’t get an extension of Obamacare subsidies that expire at the end of the year, which they have been holding out for through the 40-day shutdown, the longest in U.S. history.

Multiple Senate sources told ABC News’ Jonathan Karl that the bill would extend funding to Jan. 31 as well as provide funding for the remainder of the fiscal year to other agencies like the Department of Agriculture to pay for SNAP benefits and the Department of Veterans Affairs.

A senior Democratic senator told Karl there will be more than enough Democratic votes to pass this, although a majority of Democrats, including most of the leadership, will likely vote against it. 

Democrats would get nothing on health care beyond a promise that the Senate will vote on extending Affordable Care Act subsidies before the end of the year — essentially what Senate Majority Leader John Thune offered more than a month ago and Democrats objected to.

Although most Senate Democrats are likely to oppose this bill, they are resigned to the fact that this part of the fight is over, sources said. They will take the battle over health care to the midterms and argue that Republicans refused to do anything for the millions of Americans who will see their health insurance premiums skyrocket.

At least 60 votes are needed to move the bill forward. In past votes, Sen. Rand Paul was the only Republican to vote against the bill while Democrats Catherine Cortez Masto and John Fetterman, as well as Independent Angus King, voted for it. At least five more Democrats would have to vote in favor of the bill to move it forward.

Passage of the bill would not immediately reopen the government. The House would also have to approve the bill. The House has been out of session since September and Speaker Mike Johnson would need to call his members back to Washington to consider this bill before it could head to President Donald Trump’s desk.

The Senate wants to modify the bill in a number of ways. Should the vote succeed, it would start debate of the funding bill. If Democrats allow debate to begin, there are some key modifications that senators want to make to the bill:

• They want to change it’s expiration date from Nov. 21 to the end of January.
• They want to attach three full-year funding bills to it. The government is usually funded through 12 full-year appropriations bills. The three that senators hope to include are Military Construction and Veterans Affairs, the Legislative Branch, and the Department of Agriculture. If lawmakers fail to fund the government by the new deadline, programs covered by these bills would be fully funded through the end of the fiscal year.
• There could be the inclusion of some sort of language guaranteeing Democrats a vote by a certain date on a bill to address health care. There could also be some sort of language to reverse some of the administration’s reductions in force of government workers that occurred during the shutdown.

Unless there’s total agreement by all senators to quickly adjust the bill, it could take the Senate up to a week to process it. 

ABC News’ Jonathan Karl contributed to this report.