Incoming Senate Minority Leader Chuck Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) warned Sunday that Democrats would filibuster Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's Supreme Court candidates if they are not "mainstream."

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"If he doesn't nominate a mainstream candidate, we're going to go at him with everything we've got ... Because this is so, so important," Schumer said on NBC's "Meet the Press."

While Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) had suggested doing away with the filibuster, Schumer said Republicans "don't come with clean hands, having delayed Merrick Garland for a whole year."

President Obama nominated Garland to fill the vacancy left by the death of Antonin Scalia, but the Republican Senate blocked the nomination in hopes that a Republican would win the White House.

When Trump takes office in January, he will almost certainly appoint a conservative nominee to fill the vacancy.