Steven Mnuchin, left, President-elect Donald Trump’s nominee for treasury secretary, walks through the lobby of Trump Tower in New York on Dec. 7. President-elect Donald Trump’s Achilles heel : “You’re seeing members like John McCain and Lindsey Graham kind of coming out guns blazing, even threatening the nomination of Rex Tillerson to be secretary of state, saying that [Russian President Vladimir] Putin is a butcher and a thug, and we can’t do business with him. The concern is that Trump has this kind of personal admiration for Putin that may blind him to Russia’s real goals and to what America’s strategic stake is in doing business with Russia.