I don’t think he is an anti-semite.
He is an oddball at best on WWII history and admittedly does think the Israel lobby here wields too much power but so did William F Buckley and plenty of others...as well as even some in the far reaches of your denomination even who think Israel shouldn’t even exist yet..
That is not anti-Semitism. He simply doesn’t hold to what has become the conventional wisdom.
History is pretty replete with what is genuine anti-Jewishness.
I don’t agree with him myself on this particular stuff but shouting him down with bigot baiting falls flat for me. Let him defend his odd comments, he’s not exactly calling for pogroms.
BUCKLEY (1999): So Pat Buchanan comes along and argues that Great Britain would have been better off, in 1939, letting Hitler take Poland—and go on to take Moscow. Critics are justified in disagreeing, but it hardly follows from the conjecture that Mr. Buchanan is moved by the anti-Semitic energumenTo travel from Mr. Buchanan's provocative and irresponsible impetuosities of 10 years ago to the implied thesis that he didn't want to hurt Hitler because he admired him so, is intellectually embarrassing.