"Contrary to the assertions in your letter, there is no 'choice' for Mr. Biden to make; the subpoenas compel him to appear for a deposition on December 13. If Mr. Biden does not appear for his deposition on December 13, 2023, the Committees will initiate contempt of Congress proceedings," reads the letter, issued a week after Lowell suggested that Hunter should instead be allowed to testify publicly.

Hunter was subpoenaed on Nov. 8 to appear for a deposition before the committee. In response, Comer said: "Hunter Biden is trying to play by his own rules instead of following the rules required of everyone else," adding "Our lawfully issued subpoena to Hunter Biden requires him to appear for a deposition on December 13."

Comer and Jordan are investigating extensive evidence that the Biden family was running an international influence peddling scheme, raking in tens of millions of dollars from foreign business partners despite no obvious product or service in exchange.

House lawmakers are also seeking testimony from Hunter's uncle James Biden, as well as multiple former business associates.