Nixon wouldn't love him.
Nixon would constantly call him a goddamn soft rich kid whose daughter was married to a goddamned Jew and who didn't know the first f**king thing about his goddamned job and dealt with Congress like a goddamned candy-ass pansy.
While I agree with this mostly, I also think Nixon would simultaneously have a great deal of admiration for Trump and what he did. Nixon, after all, respected businessmen who got up the nose of East Coast types.
To answer this question, it depends a lot on the context. I doubt Andrew Johnson would though, nor Warren Harding. But that's not a high point.