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READ: Former White House official refuses to testify

A former White House official on Monday told the House Intelligence Committee he would not testify in the congressional impeachment probe into President TrumpDonald TrumpSt. Louis lawyer who pointed gun at Black Lives Matter protesters considering Senate run Chauvin found guilty as nation exhales US says Iran negotiations are 'positive' MORE given the White House's argument of immunity.

Charles Kupperman, the former deputy to former White House national security adviser John BoltonJohn BoltonTrump pushes back on Bolton poll Hillicon Valley: Facebook Oversight board to rule on Trump ban in 'coming weeks' | Russia blocks Biden Cabinet officials in retaliation for sanctions Russia blocks key Biden Cabinet officials from entering in retaliation for sanctions MORE, will not testify before Congress on Monday, despite a congressional subpoena, according to a letter from his attorney.

House Democrats have threatened Kupperman with contempt for refusing to comply.

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"We want to assure your clients, again, that it is not Dr. Kupperman who contests your clients' constitutional claim," the attorney, Charles J. Cooper, wrote to the legal counsel for the House committee.

"It is President Trump, and every President before him for at least the last half century, who have asserted testimonial immunity for their closest confidential advisors. If your clients' position on the merits of this issue are correct, it will prevail in court, and Dr. Kupperman, I assure you again, will comply with the Court's judgment."

Read the full letter below.