When he takes office on Jan. 20, 2017, Donald Trump will have something in common with Dwight Eisenhower—beyond the fact that neither was a politician before stepping into the presidency. That is, he’ll have both chambers of Congress in his own party. Not a bad place for a president to start, but one of Ike’s first lessons when he took office in 1953 was that members of his own party could sometimes be his harshest critics.