The White House on Monday rejected a long-shot effort from House Republicans to get President Joe Biden to testify before lawmakers in the GOP’s stalled impeachment inquiry.

In a letter to House Oversight Committee Chairman James Comer, the White House dismissed the invitation sent to Biden last month, calling it a “partisan charade” in an impeachment probe that has unearthed no evidence implicating the president in any wrongdoing while in public office. House Republicans had been seeking information related to the Biden family’s business dealings in what the GOP characterized as an alleged influence-peddling scheme.

“Your Committee’s purported ‘impeachment inquiry’ has succeeded only in turning up abundant evidence that, in fact, the President has done nothing wrong,” Richard Sauber, special counsel to the president, wrote in the letter sent to Comer on Monday.