GOP presidential front-runner Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE on Sunday refused to acknowledge past comments that former President George W. Bush “absolutely” should have been impeached over the Iraq War.

“I didn’t endorse anything,” Trump said on ABC’s “This Week,” before attacking rival Jeb Bush. “I think he did a terrible thing when he went into Iraq and we can all be nice and we can be politically correct and we can say how wonderful -- and Jeb Bush, his brother, took him five days before he even understood how to answer the question.”

Trump said he was the “only one on the stage” to say that invading Iraq would destabilize the Middle East.

“I was against the war even though I’m the most militaristic person there is,” he said. “I said don’t go on this stage, don’t go on the -- don’t do this war. If you do this war, you’re going to destabilize the entire Middle East. That’s exactly what happened. That’s why we have the migration and all of the other problems that we have right now in the Middle East.”

When played a tape of his comments with in 2008 saying impeachment would “absolutely” be a wonderful thing, Trump again did not directly respond.

“I don’t even think about it. It’s past time. He was -- he made a horrible mistake, we all make mistakes. His was a beauty. His was about as big a mistake as you can think of. I see all the soldiers that died, I see the wounded warriors all over who I love, who I work with, and I’ll tell you what, it was a horrible mistake. We spent $2 trillion on that war and we have nothing. “