U.S. Department of Homeland Security issued the following announcement on April 10.
“Since the beginning of this Administration, Tom Bossert has provided wise counsel to the President on Homeland security issues.
Over the last fifteen months I have enjoyed working with Tom on a range of current and emerging threats to our nation - particularly in cyber security and disaster response.
We at DHS thank him for his partnership and service and wish him the best as he takes new steps in his career.”
Original source can be found here.