The criticism from the President came a day after the White House Counsel sent a scorching letter to House Democrats, refusing their invitation to send legal representatives to a Wednesday impeachment hearing, where constitutional scholars will testify about impeachment.
It's thought that hearing is just a prelude to work by the House Judiciary Committee to draft, debate, and vote on actual articles of impeachment against President Trump.
The House Judiciary Committee has also set a deadline for this Friday for the White House to determine if it will send lawyers to participate in that process.
Democrats say they're convinced the answer will be 'no.'
"The President and GOP allies demanded testimony, then refused to read it," said Rep. Don Beyer. "They said Trump lawyers must be at hearings, then refused to send them."
"The only constant is that they can’t defend Trump’s abuses of power," Beyer added on Twitter.
During a visit to a climate change gathering in Madrid, House Speaker Nancy Pelosi was asked about the impeachment proceedings against the President - but at a news conference, she refused to comment.
Impeachment proceedings will resume on Tuesday evening, when the House Intelligence Committee is expected to vote to approve a report on the Ukraine investigation, sending that to the House Judiciary Committee.
That panel will then begin its impeachment work on Wednesday morning.