Mitch McConnell is scared a Kamala Harris presidency would spell disaster for the Republican party, prognosticating that a Democratic presidency would result in the demise of the filibuster and a liberal packing of the Supreme Court.

“Let's assume our worst nightmare – the Democrats went to the White House, the House, the Senate,” McConnell said during a speech to lawmakers in Louisville, Kentucky, Spectrum reports. “The first thing they'll do is get rid of the [Senate] filibuster. Second, you'll have two new states: D.C., Puerto Rico. That's four new Democratic senators in perpetuity."

“If they get those two new states and pack the Supreme Court, they'll get what they want," McConnell continued. "By the way, on packing the Supreme Court ... you may know this already. It's unconstitutional."

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McConnell’s remarks come as polling shows a tightening race between Republican presidential nominee Donald Trump and Harris, especially in battleground states, where Trump’s lead has shrunk from 3.5 percent to 1 percent after Harris announced Minnesota Gov. Tim Walz as her running mate.

During his speech, Spectrum reports that McConnell called the Walz-Harris ticket “the far left of the Democratic Party.”

“And by the way, that’s most Democrats today,” McConnell said, according to Spectrum.