A related question is whether realism is actually part of the Republican Party’s intellectual DNA. Philip Zelikow says no, not really:
As a historian, I think one of the more remarkable things about the Nixon-Kissinger approach to great power relations and détente is actually how anomalous it was in comparison to the record of America’s international [...]

There’s an interesting discussion right now on Foreign Policy about the future of realism and the Republican Party. Daniel Drezner kicks things off with this post, to which Will Inboden responds:
[T]he debates within Republican circles that I recall from inside and that I have found most interesting outside tend to be fairly pragmatic — what [...]