The Republican-controlled House will vote on legislation Wednesday that pairs a must-pass spending bill with tighter voting rules, setting up an election year clash with the Democrat-majority Senate that risks a partial government shutdown.

Congress must pass spending legislation before the start of the new fiscal year on Oct. 1 to avoid furloughing thousands of federal workers and shutting down a wide swath of government operations just weeks before the Nov. 5 election.

But lawmakers are at odds over an attached Republican voting bill that would require those registering to vote to provide proof of U.S. citizenship.

Spurred by Republican presidential candidate Donald Trump's claims about election fraud, House Republicans say the bill is a necessary step to prevent people living in the country illegally from voting. For their part, Democrats say it aims to drive down voter participation. A 2017 study found 30 possible instances of noncitizens voting out of more than 25 million ballots cast.

It is not clear whether Republicans will even muster enough support to pass the bill out of the House. With a narrow 220-211 majority, Republicans have few votes to spare and some have said they will vote against it.

House Republicans have spent much of the past two years paralyzed by infighting, and Speaker Mike Johnson, R-La., shelved a vote on the package last week due to lack of support.

Even if the House passes it this time, it is certain to be rejected by the Senate, leaving the two chambers at odds with less than two weeks before government funding expires.

Senate Republican Leader Mitch McConnell, R-Ky., on Tuesday appeared to show little enthusiasm for the fight, saying his party would likely be blamed if Congress allows the government to shut down shortly before the election.

"I'm for whatever avoids a government shutdown," he told reporters.

Congress faces an even more critical self-imposed deadline Jan. 1, before which they must act to raise or extend the nation's debt ceiling or risk defaulting on more than $35 trillion in federal government debt.