See my post above. Do, please, have a little look at Joe Kennedy, pro-Nazi, pro-IRA, elder of 'America's Royal Family.' What a piece of work.
Edit: Anglo-American tensions during WW2 deserves its own thread, it is an epic tale of mendacity and hubris on both sides. What I think Wals is referring to is the anti-British, mainly (but far from exclusively) Republican, isolationist tendency that wanted nothing to do with saving Europe from the Nazis.
Churchill is another hero of mine. Most heroes are flawed. He was a giant compared to FDR.