WASHINGTON (AP) — Rep. James Comer, the Republican chairman of the House Oversight and Accountability Committee, has issued a subpoena to Secret Service Director Kimberly Cheatle compelling her to appear before the committee on Monday for what is scheduled to be the first congressional hearing into the attempted assassination of former President Donald Trump.

Comer said initially that the Secret Service committed to her attendance but that Homeland Security officials appear to have intervened and there has been no “meaningful updates or information” shared with the committee.

Comer said the “lack of transparency and failure to cooperate” with the committee called into question Cheatle’s ability to lead the Secret Service and necessitates the subpoena.

Cheatle has said the agency understands the importance of a review ordered by Democratic President Joe Biden and would fully participate in it as well as with congressional committees looking into the shooting.