Donald Trump has many times said that he is a stable genius.  He's never mouthed a number, but likes to say that his IQ is the highest.   Stephen Colbert begs to differ . There has been one report that his IQ was 156, but  this article  both says it and contests it.  If this were true, he would have been the second smartest U.S. president in history.   This list  was made in 2015. The day after Joe Biden decided to end his run for president,  Donald Trump called Biden the WORST PRESIDENT in American history .  Wrong!   Earlier this year, presidential historians announced their newest survey : FULL LIST OF OVERALL PRESIDENTIAL GREATNESS RATINGS AND RANKINGS Lincoln - 93.87% FD Roosevelt - 90.83% Washington - 90.32% T Roosevelt - 78.58% Jefferson - 77.53% Truman - 75.34% Obama - 73.8% Eisenhower - 73.73% LB Johnson - 72.86% Kennedy - 68.37% Madison - 67.16% Clinton - 66.42% J Adams - 62.66% Biden - 62.66% Wilson - 61.8% Reagan - 61.62% Grant - 60.93% Monroe - 60.15% GHW Bush - 58.54%