House Republicans are investigating whether President Joe Biden had a hand in his son Hunter Biden defying their subpoenas to testify earlier this month.

House Oversight Committee Chair James Comer, R-Ky., and Judiciary Committee Chair Jim Jordan, R-Ohio, sent a letter Wednesday to White House counsel Edward Siskel saying they “are compelled to examine as part of our impeachment inquiry whether the President engaged in a conspiracy to obstruct a proceeding of Congress. “

The Republican congressmen requested the White House turn over all executive department documents and communications related to Hunter Biden’s missed deposition by no later than Jan. 10.

House Republicans are conducting an impeachment inquiry into potential links between the president and his son’s foreign business deals. They have claimed to have substantial evidence but to date have produced no solid proof that Joe Biden profited from his son’s business deals or that Hunter Biden’s professional interests influenced the elder Biden’s actions in office.

President Biden has repeatedly denied having any involvement in or knowledge about Hunter Biden’s business affairs. 

Hunter Biden was subpoenaed to testify Dec. 13 in a closed-door deposition before the Oversight Committee. Instead, he appeared outside the Capitol that morning reiterating to reporters his willingness to testify publicly, an offer House Republicans rejected. Comer and Jordan plan to hold contempt of Congress proceedings against Hunter Biden.

They have pointed to a comment made later on Dec. 13 by White House press secretary Karine Jean-Pierre when asked about Hunter Biden’s actions that day. In a press briefing, Jean-Pierre said, “The president was certainly familiar with what his son was going to say.”

The Republican committee chairs noted it is against federal law for someone to attempt to “influence, obstruct, or impede … the due and proper exercise of the power of inquiry” by Congress.

The White House did not immediately respond to an email from Spectrum News on Thursday morning seeking comment about the letter.

In his Dec. 13 comments, Hunter Biden said: “Republicans do not want an open process where Americans can see their tactics, expose their baseless inquiry, or hear what I have to say. What are they afraid of? I’m here. I’m ready.”