In 2008, Donald Trump said George W. Bush should’ve been impeached

https://www.washingtonpost.com/news/the-fix/wp/2016/02/13/in-2008-donald-trump-said-george-w-bush-shouldve-been-impeached/

Trump: "It just seemed like she was really going to look to impeach Bush & get him out of office. Which personally I think would have been a wonderful thing."

Blitzer interjected: "To impeach him?"

"For the war," Trump said. "For the war! Well, he lied!"

"Hillary's a great friend of mine," Trump said, referring to the front-runner for the Democratic nomination. "Her husband's a great friend of mine."
 https://www.youtube.com/watch?v=Nbm3ZmoF-6k

Trump on impeaching Clinton: No (1990s comments)
Trump on impeaching Bush II: Yes (2000s comments on CNN)
Trump on impeaching Obama: Yes (2014 comments. Twitter/Fox and Friends)
Trump on impeaching Trump: No