A former director of the CIA and FBI penned a letter expressing concerns over President-elect Donald Trump’s picks of Tulsi Gabbard and Kash Patel to lead intelligence agencies.

William Webster, a Republican, is the only person to have led both the CIA and FBI, serving under the administrations of former Presidents Jimmy Carter and Ronald Reagan. In a letter to senators on Thursday, Webster expressed concern about Gabbard becoming the next director of national intelligence and Patel being the next FBI director, arguing they do not meet the needs of such posts.