Sen. Chuck SchumerChuck SchumerDemocrats blast Trump for commuting Roger Stone: 'The most corrupt president in history' A renewed emphasis on research and development funding is needed from the government Data shows seven Senate Democrats have majority non-white staffs MORE (D-N.Y.) is criticizing Senate Majority leader Mitch McConnellAddison (Mitch) Mitchell McConnellHillicon Valley: Facebook considers political ad ban | Senators raise concerns over civil rights audit | Amazon reverses on telling workers to delete TikTok Ernst: Renaming Confederate bases is the 'right thing to do' despite 'heck' from GOP Advocacy groups pressure Senate to reconvene and boost election funding MORE for saying the Senate should not move forward with a Supreme Court nominee during President Obama's remaining months in office.

"You know, the kind of obstructionism that Mitch McConnell's talking about, he's harkening back to his old days. You know, he recently he said, 'Well, I want regular order,' " Schumer said on ABC's "This Week."

"But in 2010, right after the election or right during the election, he said, 'My number-one job is to defeat Barack ObamaBarack Hussein ObamaHow Trump can get his mojo back Trump confirms 2018 US cyberattack on Russian troll farm Democrats see convention as chance to underscore COVID-19 message MORE,' without even knowing what Barack Obama was going to propose. Here, he doesn’t even know who the president's going to propose and he said, 'No, we're not having hearings; we're not going to go forward to leave the Supreme Court vacant at 300 days in a divided time,' " he said.

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Schumer said that kind of strategy "isn't going to last," adding that the American people don't like obstruction.

He added that he thinks the president will nominate someone who is "mainstream."

"I believe that many of the mainstream Republicans, when the president nominates a mainstream nominee, will not want to follow Mitch McConnell over the cliff," he said.

"When you go right off the bat and say, 'I don't care who he nominates, I am going to oppose him,' that's not going to fly," he said.