Hours before the U.S. House of Representatives was expected to vote to approve the articles of impeachment against him on Wednesday, President Trump said on Twitter that he couldn’t believe this “terrible Thing” was happening to him and asked supporters to pray for him.

“Can you believe that I will be impeached today by the Radical Left, Do Nothing Democrats, AND I DID NOTHING WRONG!” the president tweeted. “A terrible Thing. Read the Transcripts. This should never happen to another President again. Say a PRAYER!”

Can you believe that I will be impeached today by the Radical Left, Do Nothing Democrats, AND I DID NOTHING WRONG! A terrible Thing. Read the Transcripts. This should never happen to another President again. Say a PRAYER! — Donald J. Trump (@realDonaldTrump) December 18, 2019

The tweet came before the House convened to debate the charges against Trump — abuse of power and obstruction of Congress — over his dealings with Ukraine, with a full House vote to follow, probably in the evening.

If the two articles pass, as expected, Trump will become the third president in U.S. history to be impeached.

[Watch live: House takes up Trump's impeachment ahead of historic floor vote]

During the debate on the House floor, Trump took to Twitter again to air his grievances, this time in all-caps.

SUCH ATROCIOUS LIES BY THE RADICAL LEFT, DO NOTHING DEMOCRATS. THIS IS AN ASSAULT ON AMERICA, AND AN ASSAULT ON THE REPUBLICAN PARTY!!!! — Donald J. Trump (@realDonaldTrump) December 18, 2019

On the eve of the vote, the president sent a scathing, insult-filled letter to House Speaker Nancy Pelosi, accusing Democrats of “declaring open war on American Democracy,” among other things.

“I write to express my strongest and most powerful protest against the partisan impeachment crusade being pursued by the Democrats in the House of Representatives,” Trump wrote in the six-page letter, salted with at least eight exclamation marks. “This impeachment presents an unprecedented and unconstitutional abuse of power by Democrat Lawmakers, unequaled in nearly two and a half centuries of American legislative history.”

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President Trump speaks to reporters in the Oval Office on Tuesday. (Kevin Lamarque/Reuters)

Trump also said Pelosi was lying about praying for him.

“Even worse than offending the Founding Fathers, you are offending Americans of faith by continually saying ‘I pray for the President,’ when you know this statement is not true, unless it is meant in a negative sense,” the president wrote.

“It is a terrible thing you are doing,” he added, “but you will have to live with it, not I!”

Speaking to reporters on Capitol Hill, Pelosi said she hadn’t fully read Trump’s letter, but called what she did read “really sick.”

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