Senate Majority Leader Harry ReidHarry Mason ReidThe Memo: Democrats confront prospect of long primary Bottom Line Lobbying world MORE (D-Nev.) filed cloture on a constitutional amendment meant to reverse two recent Supreme Court decisions on campaign spending.

Republicans are likely to vote against the amendment on a procedural vote that is expected to occur Thursday.

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Earlier this week, Republicans supported advancing the measure because they said it deserved debate — that move also tied up the Senate from considering anything else for nearly three days.

Democrats have had less time to hold other political votes during the two-week session before adjourning for the midterm elections. Reid has said he also wants to hold votes on Democrats' political priorities, such as equal pay for women and refinancing student loan rates.  

Reid has threatened to keep senators in town over the weekend in order to accomplish all of his legislative goals. But the Senate only has two weeks to pass a short-term continuing resolution (CR) to keep the government funded after Sept. 30 and reauthorize the Export-Import Bank. 

Republicans have offered support for the Supreme Court’s decisions in Citizens United v. Federal Election Commission and McCutcheon v. FEC. They say campaign spending is a form of free speech and that the decisions removing certain limits on spending protected First Amendment rights.

The 2010 Citizens United ruling struck down restrictions that had barred corporations and unions from spending money from their general treasury funds to support or oppose candidates. In McCutcheon, the court struck aggregate limits on individual contributions to candidates. 

Democrats argue these rulings have allowed billionaires to buy election results through campaign donations.

Citizens United was one of the worst decisions in the history of the Supreme Court,” said Sen. Al FrankenAlan (Al) Stuart FrankenTake Trump literally and seriously in Minnesota Ninth woman accuses Al Franken of inappropriate contact Al Franken to host SiriusXM radio show MORE (D-Minn.), who is up for reelection this November. “It was a disaster.”

Republicans blasted the vote as a political stunt by Democrats ahead of the midterm elections.

“Nobody believes this is going to happen,” Sen. Roy BluntRoy Dean BluntGOP senators balk at lengthy impeachment trial Alcohol industry races to save tax break by year-end deadline McConnell, GOP leaders say they won't be watching House impeachment hearing MORE (R-Mo.) said Wednesday. “The only thing we’re surely talking about is trying to score last minute political points.”

The amendment is almost certain to fail, as it would need to win two-thirds support to pass the Senate, and then would still need to move through the House and be ratified by two-thirds of the states.

The amendment from Sen. Tom UdallThomas (Tom) Stewart UdallBureau of Land Management staff face relocation or resignation as agency moves west Overnight Energy: EPA watchdog slams agency chief after deputy fails to cooperate in probe | Justices wrestle with reach of Clean Water Act | Bipartisan Senate climate caucus grows Hillicon Valley: Twitter to refuse all political ads | Trump camp blasts 'very dumb' decision | Ocasio-Cortez hails move | Zuckerberg doubles down on Facebook's ad policies | GOP senator blocks sweeping election reform bill MORE (D-N.M.) would authorize Congress and the states to regulate and limit fundraising and spending on federal candidates.

It would also prohibit the Supreme Court from reversing any future campaign finance legislation passed by Congress.