The Justice Department is investigating Rep. Cory Bush, Democrat of Missouri, for misappropriating funds, after the DOJ subpoenaed the House sergeant-at-arms Monday for related documents, a senior congressional source familiar with the investigation told CNN.
Separately, two law enforcement sources told CNN that the investigation is targeting Bush, who is the subject of a corruption investigation.
According to a source familiar with the investigation, the subpoena involved misappropriation of funds surrounding the defense.
Bush said in a statement that the Justice Department is reviewing his campaign's security services spending and is fully cooperating with the investigation.
“First, I have held myself, my campaign, and my position to the highest level of integrity,” Bush said in the statement. “I believe in transparency, which is why I can confirm that the Department of Justice is reviewing my campaign spending on security services. We are fully cooperating with this investigation and I want to take this opportunity to outline the facts and the truth.
Bush said he did not use any federal tax dollars for private security services and that he complied with House rules. Bush further explained that she retained her husband's security services because he had extensive experience in this area and could provide the necessary services at or below fair market rates.
The Justice Department declined to comment.
The Clerk of the House on Monday read from the floor a letter written by the sergeant at arms informing the chamber of the subpoena.
“The Office of the Sergeant at Arms for the House of Representatives has been served with a grand jury subpoena for documents issued by the United States Department of Justice,” the clerk said, reading the letter.
“After consulting with the Office of General Counsel, I have determined that compliance with the subpoena is consistent with the House's rights and privileges,” they continued.
This story and topic have been updated with additional improvements.
CNN's Evan Perez contributed to this report.