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 on Wednesday blasted House Democrats for holding a caucus meeting to discuss "the 'I-word'" — impeachment — calling allegations he conspired with Russia "the greatest hoax in history."

In impromptu remarks in the Rose Garden, Trump said he scrapped infrastructure talks with Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) and Senate Minority 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 (D-N.Y.) after hearing that Pelosi accused him of being "engaged in a cover-up."

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“This meeting was set up a number of days ago,” Trump said of talks with Democrats. "All of a sudden I hear last night they’re going to have a meeting right before this meeting to talk about the 'I-word.' The 'I-word.' Can you imagine?"

Democratic leadership has been under renewed pressure from House members to move forward on impeachment amid frustrations that the Trump administration is stonewalling Democratic investigations.

The president defended himself against allegations that he conspired with Russia, calling it "the greatest hoax in history."

"When I went to Wisconsin, and Michigan and Pennsylvania, I don’t say, 'oh let’s call Russia,'" Trump said.

House Democrats gathered Wednesday morning to discuss their oversight strategy as an increasing number of party members have voiced support for starting impeachment proceedings against Trump. Many have cited the findings of special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation, as well as the White House stonewalling Democratic requests for documents and testimony as part of ongoing House probes, as reasons for their calls.

Mueller’s investigation did not establish that the Trump campaign conspired with the Russian government, and neither exonerated the president on obstruction of justice nor charged him with that crime.

Pelosi continued to urge caution about rushing toward an impeachment proceeding, but told reporters afterward that she believes Trump "is engaged in a cover-up."

"We do believe that it is important to follow the facts, we believe that no one is above the law, including the president of the United States, and we believe the president of the United States is engaged in a cover-up," Pelosi said.