This just in, apparently the FBI only seizes passports if they are on the search warrant, so they may be evidence of a crime he committed or could contain references of plans to flee (approved visas)

3, huh.....

If Trump does hold another nations passport, guessing the same nation as much of congress also have duel citizenship with. Here's a clue for ya all.
The nation in question named a new housing estate after him, established on disputed ground.

Trump always tells the truth when he is confessing publicly, which he has done many times. Some people would say " I wish he would stop tweeting". But I would say, " I think he should keep it up because it is evidence.

As I heard said, earlier, "Um, if Trump told me he was wearing a red tie, I would doubt the veracity of the statement."
That said, why would the FBI take passports?

• a mistake.... doubtful
• they were diplomatic and therefore supposed to be surrendered to the National Archives..... quite possible
• the case is a lot deeper and farther along and Trump did some real bad shit...... that would be wonderful, but I'm not holding my breath.