NBC producer Kristen Welker has reported that the US Secret Service has revoked the top secret security clearances of all 11 agents and officers.
"Pending investigation, their top secret clearance has been revoked," George Ogilvie, a Secret Service spokesman, said.
More top news
The Facebook founder revealed the plan as he and wife Priscilla Chan announced the birth of their baby daughter, Max.
At least 300 people are actively promoting and recruiting for the terror group from within the United States, academics have found.
Hollywood film director and actor Steven Seagal has been asked to train Serbian special forces in martial arts.