It cracks me up to see libertarians all excited when Trump says something negative about the Fed. Get real folks. He has no principled objections to the Fed, nor does he give a shit about monetary policy, nor is he going to do anything to limit the Fed's powers. If anything, he'll make matters worse.
He's criticising it for the same reason he criticises Congress, the Supreme Court, or the people investigating him: they make it harder for him to do the thing he DOES care about. And that's acquiring more wealth, power, and applause for one Donald J. Trump.
So don't get your hopes up or waste your time thinking he gives a shit about the very real problems with the Fed. He doesn't.