Sen. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.) on Monday predicted that Democrats would launch a filibuster against whoever President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE picks for the Supreme Court.

“This is a stolen seat. This is the first time a Senate majority has stolen a seat,” Merkley told Politico. “We will use every lever in our power to stop this. ... I will definitely object to a simple majority.”

Though any senator can require a 60-vote threshold for a Supreme Court nominee, filibusters against picks for the top court remain rare. Democrats last tried to use the filibuster to block Justice Samuel Alito under President George W. Bush's administration and failed.

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But Merkley's remarks reflect the heated tensions around the judicial branch ahead of Trump's announcement on Tuesday. Democrats are still quick to point out that Republicans refused to give Merrick Garland, President Obama's pick to replace conservative Justice Antonin Scalia, a hearing or a vote.

Republicans have also been gearing up for the looming court battle, urging Democrats to treat Trump's first nominee the same way as Supreme Court picks under President Obama's first term.

“Under [President Bill] Clinton, [Ruth Bader] Ginsburg and [Stephen] Breyer, no filibuster, no filibuster. In other words, no one required us to get 60 votes,” Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE (R-Ky.) told reporters last week. “Under Obama, [Sonia] Sotomayor and [Elena] Kagan, no filibusters. That's apples and apples. First term, new president, Supreme Court vacancy.”

He added, “What we hope would be that our Democratic friends will treat President Trump's nominees in the same way that we treated Clinton and Obama.”

Trump said Monday that he would announce his pick to replace Scalia Tuesday night.

It’s not clear if Democrats would be able to support a filibuster on any Trump pick.

A number of Democrats in the Senate represent red states that voted for Trump — and many of them are up for reelection next year.

The Senate Leadership Fund (SLF), which has ties to McConnell, quickly sent out emails questioning whether the red-state Democrats would back Merkley’s filibuster.

Of Sen. Joe Manchin Joseph (Joe) ManchinBiden promises Democratic senators help in battleground states Senate leaders quash talk of rank-and-file COVID-19 deal OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (D-W.Va.), the group said: “Will he stand with the people of his state who overwhelmingly voted for Donald Trump to be able to pick a Supreme Court nominee? Or will he stand with [Sens.] Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE [Mass.], Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE [Vt.], and the rest of the Democratic caucus that only cares about its far left base of permanent protesters?”

The SLF sent out similar releases for Democratic Sens. Claire McCaskill Claire Conner McCaskillDemocratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally Missouri county issues travel advisory for Lake of the Ozarks after Memorial Day parties MORE (Mo.), Joe Donnelly Joseph (Joe) Simon DonnellyEx-Sen. Joe Donnelly endorses Biden Lobbying world 70 former senators propose bipartisan caucus for incumbents MORE (Ind.), Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (N.D.) and Jon Tester Jonathan (Jon) TesterPence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Filibuster fight looms if Democrats retake Senate MORE (Mont.), who are each up for reelection in states carried by Trump.

Republicans hold 52 seats in the Senate and would need eight Democrats to vote with them to break a filibuster.

The GOP also could opt for the “nuclear option” by changing Senate rules to get rid of the 60-vote threshold for Supreme Court nominees. McConnell has repeatedly signaled he does not want to take that step, most recently in an interview with The Hill on Friday.

The National Republican Senatorial Committee (NRSC) also sent out a release questioning if “eight is enough,” playing off Democrats slogan last year that the Supreme Court needed nine justices.

“National Democrats’ lurch to the left is quickly becoming a problem for Senate Democrats up for reelection in red states,” said NRSC spokesman Bob Salera. “It will be telling whether Senate Democrats honor the will of voters and listen to their own ‘We need nine’ rhetoric or side with Keith Ellison and the far left, and adopt a ‘take our ball and go home’ strategy with the Supreme Court.”

Senate Democratic leadership hasn't publicly signed on to Merkley's push, but Senate Minority Leader Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.) has pledged to fight “tooth and nail” if Trump's nominee isn't “mainstream.”

“If the nominee is not bipartisan and mainstream, we absolutely will keep the seat open,” Schumer told CNN’s “State of the Union” earlier this month.