Former GOP presidential campaign manager Steve Schmidt said Wednesday that "Democrats should dig in hard" and "do everything they conceivably can do to block" 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's Supreme Court nomination.

"And for the fabric of our democracy, Democrats should dig in hard here and do everything they conceivably can do to block this nomination, any nomination from going forward until after we see what happens in the midterm election," Schmidt said in a phone interview on MSNBC, where he serves as a political analyst.

Schmidt, who previously worked for 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's (R-Ariz.) presidential campaign, has been one of Trump's harshest critics on the network. He announced this month he would leave the Republican party and start voting for Democrats.

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Schmidt's comments come after Trump and 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.) announced their intention to vote on the president's selection to replace the retiring Anthony Kennedy in the fall, prompting widespread criticism from Democrats and setting up what promises to be a highly contentious confirmation process.

"Mitch McConnell has, as much as anyone, done great damage to the United States Senate as an institution that was once known as the world’s greatest deliberative body," said Schmidt on MSNBC.

"They stole a Supreme Court seat from the Democrats," he continued.

Democrats have argued that McConnell, who stalled a vote on former President Obama's Supreme Court nominee in 2016, should wait until after the midterms for a confirmation vote on Trump's forthcoming nominee.

“Millions of people are just months away [in the November midterm elections] from determining the senators who should vote to confirm or reject the president’s nominee and their voices deserve to be heard,” Senate Democratic 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 (N.Y.) said on the Senate floor, adding that “anything by that would be the absolute height of hypocrisy.”

Schmidt also made the argument that the president and Republicans are actually in the minority because Trump lost the popular vote by 3 million, thereby in his view allowing "a minority that is ruling the majority of the country who are opposed to this president."

"This is also, and I think it is important to point out, a president who is increasingly lawless, who asserts himself to be above the law, who attacks constantly fundamental institutions and pillars in the middle of a criminal investigation that has moved closer and closer and closer to the Oval Office," Schmidt added.

"The reality is, you have Donald Trump lost the popular vote by 3 million. He won by 78,000 votes across three states," Schmidt said. "And the Republicans control all three branches of government, the legislative and by Republican nominees on the Supreme Court."

"So, we have a minority that is ruling the majority of the country who are opposed to this president, and that is extremely unhealthy in a democracy," he said.

Trump nominated Neil Gorsuch to the Supreme Court to replace the late Justice Antonin Scalia in January 2017 shortly after taking office.

Gorsuch was confirmed in April 2017 by a 54-45 vote, mostly along party lines, with just three Democrats breaking ranks.

Kennedy, who was nominated by President Reagan in 1988, will officially retire on July 31.