If you have access to back issues or reprints of The Objectivist, read her 1968 kiboshing of George Wallace; it's as close as you'll get (which is close indeed) to what she'd say about Trump.
The character most resembling him in her fiction is James Taggart. Both are classic mixed-economy businessmen, getting rich by government favors and connections in a highly-regulated industry. Both are contemptuous of ideas and principles. Both are what Objectivist jargon calls social metaphysicians. Taggart stroked his vanity by letting his wife think he was a man of acheivement. Trump is trying to do this with the entire world.
Scott Bouranis reacted to Reidy in Trump