Asked whether he agreed with his 2008 comments favoring Bush's impeachment, Trump said he "was in the private sector" and not thinking about the issue "too much."
"Certainly, the war in Iraq was a disaster. No, not to be impeached, but the war in Iraq was a disa— it was a mistake," Trump said on NBC's "Meet the Press."
"He just made a mistake. ... [Impeachment] is for other people to say. I can say this, it may not have been impeachable because it was a mistake."
In a separate interview, Trump said he didn't "endorse anything" when it came to impeachment in 2008. He also suggested that Republicans who continue to support the Iraq War are capitulating to political correctness.
"I think he did a terrible thing when he went into Iraq," Trump said of Bush on ABC. "We can all be nice and we can be politically correct and we can say, 'How wonderful.'"
"This was about as big a mistake as we can think of," he added later. "It was a horrible mistake."