Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) on Monday floated that the Senate could force President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE to name a moderate to the Supreme Court — if they reject his "extreme" nominee first.

"If the Senate rejects an extreme candidate, it would present President Trump the opportunity to instead select a moderate, consensus nominee," Schumer wrote in a New York Times op-ed.

With Republicans holding a slim 51-49 majority, Democrats don't have the ability to block whoever Trump nominates to fill the vacancy being created by Justice Anthony Kennedy's decision to retire at the end of the month.

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But because Republicans have a "razor-thin" majority, Schumer argues, picking up one or two Republican senators to vote against Trump's pick "will make the difference between the confirmation and rejection of an ideological nominee."

"While the number of Democrats in the Senate is not a majority, the number of senators who believe in protections for those with pre-existing conditions and women’s reproductive rights is a majority of the Senate. Given this vacancy, the best way to defend those rights is for a bipartisan majority in the Senate to lock arms and reject a Supreme Court nominee who would overturn them," Schumer wrote in the Times op-ed.

With Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.) absent as he undergoes treatment for brain cancer, the GOP majority is effectively capped at 50 votes in the Senate. That means Democrats would only need to win over one GOP vote to have a majority. If McCain were to return, they would need to win over two Republicans to sink a Trump nominee.

But every GOP senator voted for Trump's first Supreme Court pick, Neil Gorsuch.

GOP Sens. Susan Collins Susan Margaret CollinsClub for Growth to spend million in ads for Trump Supreme Court nominee Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November MORE (Maine) and Lisa Murkowski Lisa Ann MurkowskiClub for Growth to spend million in ads for Trump Supreme Court nominee Pebble Mine CEO resigns over secretly recorded comments about government officials Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election MORE (Alaska) are currently viewed as two potential swing votes, because of the implications for Roe v. Wade, the 1973 case that established the right to abortion nationwide. Kennedy was the fifth justice in a 1992 decision that reaffirmed that ruling.

Trump is expected to announce his Supreme Court pick on July 9, the same day senators return from a weeklong recess.

Schumer added in his op-ed that Kennedy's retirement has sparked "the most important vacancy" on the court in his lifetime.

Democrats and their allied outside groups have seized on the abortion case, as well as potential legal challenges to the Affordable Care Act, as they try to drum up momentum ahead of the looming nominations fight.

"Two issues of similar and profound consequence, which could well defeat a nominee who opposes them, are the fate of affordable health care and a woman’s freedom to make the most sensitive medical decisions about her body," Schumer wrote

He added that if voters don't want a justice who will target both of those issues "tell your Senators they should not vote for a candidate from Mr. Trump’s preordained list."

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) said last week that the upper chamber will move quickly to confirm a Trump nominee.

Trump was initially expected to select his next Supreme Court nominee from a list of 25 names.

But Collins said over the weekend that the White House had expanded its search and added "a few additional, potential nominees ... to that list."

Both Collins and Murkowski had publicly suggested late last week that the White House should broaden its search.