A Washington bar is offering a round of drinks every time President Trump tweets about former FBI Director James Comey during his highly anticipated Senate testimony Thursday.

Union Pub will open at 9:30 a.m. and will be “buying a round of drinks for the house every time Trump Tweets about Comey during his testimony,” a Facebook post for the event read.

“This 'special' will run til Comey's testimony is over, or 4pm, whichever is earlier.”

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Thursday's hearing is Comey's first appearance in front of Congress since Trump abruptly fired the FBI chief last month.

Comey is expected to testify about the investigation into Russian interference in the election and his past conversations with Trump, including allegations that the president asked him to ease off the investigation into former national security adviser Michael Flynn.

The Washington Post reported the president may tweet during the testimony if he feels the need to respond.

But Trump is also set to speak at a conservative religious conference at 11:30 a.m., likely overlapping with part of the testimony.