Sen. Chuck SchumerCharles (Chuck) Ellis SchumerCorker won’t campaign against Democrat running for Tennessee Senate seat Family, friends mourn death of Barbara Bush James Comey’s history of misconduct  MORE (D-N.Y.) is criticizing Senate Majority leader Mitch McConnellAddison (Mitch) Mitchell McConnellSenate blocks bill that opponents say weakens water pollution rules Pittsburgh police told to prepare for protests over potential Mueller firing: report Senate repeals auto-loan guidance in precedent-shattering vote 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 Obama Stormy Daniels’s 'View' is incorrect Trump attorneys defend Obama’s Atlantic Ocean protections Don’t let Washington’s toxic partisanship infect foreign policy, too 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.

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.