George Conway, husband to White House counselor Kellyanne Conway and a frequent critic of President Trump, on Wednesday predicted that Republicans in the Senate would break with the president and vote to remove Trump from office if the House votes to impeach.

Conway tweeted that Republican senators would hide their decision to vote against the president until the last possible minute on the issue.

"I agree with this. There may be Republican senators who won't say a word until the moment they say 'guilty' when the roll is called at the end of an impeachment trial," he tweeted, responding to a political commentator who argued that Republican senators would vote to impeach the president because many "privately hate" Trump.

Conway has in the past called for Trump to be removed from office by members of his Cabinet via provisions in the 25th Amendment.

His tweet comes as Speaker Nancy Pelosi (D-Calif.) announced the beginning of a formal impeachment inquiry Tuesday afternoon, with Pelosi saying Trump "must be held accountable" for his actions.

Calls for impeachment proceedings have reached a fever pitch in Washington following reports of call between Trump and Ukrainian President Volodymyr Zelensky in which Trump asked Zelensky to investigate the son of former Vice President Joe Biden, who is the Democratic front-runner to face Trump in the 2020 presidential election.

After those reports, Conway over the weekend once again called on the House to begin impeachment proceedings.

"Trump has already done more than enough to warrant impeachment and removal," Conway wrote in an op-ed published by The Washington Post. "The current whistleblowing allegations, however, are even worse."

The White House released a transcript of the call with the Ukrainian president on Wednesday.

Biden's name is mentioned twice on the call, according to the document, which is titled formally as a "memorandum of telephone conversation." The document makes clear it is not a verbatim transcript of the conversation.