The U.S. State Department’s third-ranking official, Tom Shannon, announced on Thursday that he would be stepping down, making him the latest diplomat to quit since Donald Trump became president.
Shannon has served for more than 34 years under six presidents and 10 secretaries of state.
He announced his departure in a letter to the department staff but did not give a specific reason. Shannon only said he was leaving for personal reasons.
“My decision is personal, and driven by a desire to attend to my family, take stock of my life, and set a new direction for my remaining years,” Shannon wrote in a note to staff after informing Secretary of State Rex Tillerson on Wednesday of his decision to retire.
Shannon’s departure is part of a steady stream of senior career diplomats who have left since Trump became president.