Bush43 worried about deficits
wait what
Oops, I was thinking George H W Bush. Sorry. George H W Bush was probably the only Monetarist President. There were prior Republican Presidents like Eisenhower who were concerned about deficits, but Eisenhower pre-dated the existence of Monetarist theory.
If the poster is referring to Modern Monetary Theory, then yes, defacto (virtually) all Congressional Republicans are austerity favoring Monetarists when a Democrat is President, but argue at least partially based on MMT for tax cuts when a Republican is President.