Yep, something in your life has merely raised suspicion for someone in the executive branch working for Trump. It could be your religion. It could be the books you checked out of the library. It could be your anti-Trump postings on Ron Paul Forums. And there's no requirement that you actually have committed any crime and been found guilty of it. The mere suspicion on their part, according to their values and discretion, is all it takes, and they can ban you from buying a gun. This could be expanded to stop the entire country from buying guns if a president wanted to without any further act of Congress, and make it so that instead of specially selecting people to stop from buying weapons, they specially select the ones they want to allow to buy them. And even if Trump didn't want to (and don't be so sure he doesn't), the power would pass to someone else, eventually someone who would want to use it that way.
Nobody who supports this is anything remotely close to a supporter of the 2nd Amendment.
And yes, that includes the NRA.
I'll say that's a problem. Are you OK with that?
And you don't understand that someone who wants to do that with guns is an opponent of the right to keep and bear arms?