Back during the Yalta Conference at the end of World War II, President Franklin D. Roosevelt said he had forged a personal friendshiip with Josef Stalin, claiming that he "had the measure of the man". Stalin was a dictator and murderer, but Roosevelt believed that the two had become so close that Stalin could be trusted when he said he'd hold free elections in Eastern Europe.
Republicans excoriated Roosevelt, claiming him to be a "sick old man" who foolishly believed in "personal diplomacy" instead of "realpolitik" (realistic, pragmatic politics).
The GOP today has declared itself "disappointed" in Donald Trump's statements in Helsinki. But, you know, that's not really enough to oppose him. You know.