The House voted in December to formally authorize the inquiry even in the absence of evidence of wrongdoing by the president. Republicans allege Biden improperly traded access while he served as vice president in President Barack Obama's administration. Biden denies the allegations.
"I write to you today because it is clear the house Republican impeachment is over," Siskel wrote. "The House Majority ought to work with the President on our economy, national security, and other important priorities on behalf of the American people, not continue to waste time on political stunts like this."
A spokesperson for Johnson accused Biden of lying and said it was not up to the White House to decide what happened with the inquiry.
"The White House does not get to decide how impeachment gets resolved, that is for Congress to decide,” Raj Shah said in an email.
The White House letter reflects exasperation with House Republicans over what Biden officials view as a political stunt as the Democratic president seeks re-election this year in a race against Republican former President Donald Trump.
"For over a year, House Republicans have been investigating President Biden in an effort to find something — anything — to hurt the President politically," Siskel wrote. "Instead, the investigation has continually turned up evidence that, in fact, the President did nothing wrong."
The timing of the letter also suggests the White House sees vulnerability for Johnson, whose majority in the chamber will slip to 218-213 next week when Congressman Ken Buck, a Republican who has criticized the impeachment inquiry, exits office early.
The president and Johnson were set to meet later on Friday at a reception on Capitol Hill.
Published 15 March 2024, 17:08 IST