House Republicans are seeking information from President Joe Biden's counsel about whether the president knew in advance that his son Hunter Biden planned to defy a congressional subpoena this month.

Reps. James Comer (R-KY) and Jim Jordan (R-OH) asked White House counsel Ed Siskel on Wednesday to provide them with any communications Joe Biden had with his son or his son's defense attorneys related to the subpoena.

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"We are compelled to examine as part of our impeachment inquiry whether the President engaged in a conspiracy to obstruct a proceeding of Congress," the congressmen wrote in their letter.

They cited comments White House press secretary Karine Jean-Pierre made when asked on Dec. 13 about the deposition. Hunter Biden did not appear for the closed-door proceeding that was scheduled for that day and instead delivered a speech outside the U.S. Capitol, during which he reiterated his stance that he is only willing to appear for a public hearing.

Joe Biden was “certainly familiar with what his son was going to say” that day, Jean-Pierre told reporters.

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The Republicans wrote that Jean-Pierre's statement indicated that the president "had some amount of advanced knowledge that Mr. Biden would choose to defy two congressional subpoenas."

They asked that Siskel provide them with the requested documentation by Jan. 10.

This story is developing.