As it turns out, Trump’s support of the Iraq War was as recent as 2002:

Via Buzzfeed:

For months, Donald Trump has claimed that he opposed the Iraq War before the invasion began — as an example of his great judgment on foreign policy issues. But in a 2002 interview with Howard Stern, Donald Trump said he supported an Iraq invasion. In the interview, which took place on Sept. 11, 2002, Stern asked Trump directly if he was for invading Iraq. “Yeah, I guess so,” Trump responded. “I wish the first time it was done correctly.” Trump has repeatedly claimed that he was against the Iraq War before it began, despite no evidence of him publicly stating this position. On Meet the Press, Trump said there weren’t many articles about his opposition because he wasn’t a politician at the time. “Well, I did it in 2003, I said it before that,” Trump said of his opposition to invading Iraq. “Don’t forget, I wasn’t a politician. So people didn’t write everything I said. I was a businessperson. I was, as they say, a world-class businessperson. I built a great company, I employed thousands of people. So I’m not a politician. But if you look at 2003, there are articles. If you look in 2004, there are articles.”

So his story is just not true in any way, shape, or form. What makes it worse is that he’s been lying about his own record to attempt to harm other candidates for months:

At the Feb. 6 debate in New Hampshire, Trump said, “I’m the only one up here, when the war of Iraq — in Iraq, I was the one that said, ‘Don’t go, don’t do it, you’re going to destabilize the Middle East.’” At a Republican debate in September of last year, Trump said he could provide 25 stories showing his early opposition to the Iraq War. “You can check it out, check out — I’ll give you 25 different stories,” Trump said.

UPDATED. We can add to the Howard Stern episode, this appearance by Trump on Neil Cavuto’s Show in January 2003

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Here, if not egging on the invasion, he is certainly unopposed to it.

Well, now it has been checked out and these are the facts. In 1999, Donald Trump expressed the opinion that invading Iraq would be necessary if they kept evading their obligations under the cease fire agreement that ended the Gulf War. Let me say that was a logical and sensible position to take. In 2002, he says he was in favor of invading Iraq because the job had not been done right the first time. It was only after his liberal social circle started opposing the war that he, too, became an opponent of the war.