The Secret Service's Compulsion to Testify

Could certain Secret Service who were in the area at that same time be asked to testify what they saw with the family? I would think that, you know, their duty is to the country, not to their specific protectees. Sound of freedom is this runaway hit movie that's beating Harrison Ford's latest, uh, Raiders of the Lost Ark movie. Jim Cavizo came out and said, he feels like religion. Christiana religion is under attack. Have you heard that before? Does he have a case?