Of course he is a liar.
----Documented Lie ---
Bush lied to the american people and the world about calling for a second, separate UN resolution authorizing force against iraq. In a press conference he lied to reporters and told them that even if he thought he was going to lose the UN vote on the second resolution, that he would call for a vote in the UN before he attacked Iraq. Bush lied and instructed his ambassador not to call for the vote when it was clear he was going to lose.
Here is what he said :
http://www.whitehouse.gov/news/releases/2003/03/20030306-8.html
Q Thank you, Mr. President. As you said, the Security Council faces a vote next week on a resolution implicitly authorizing an attack on Iraq. Will you call for a vote on that resolution, even if you aren't sure you have the vote?
THE PRESIDENT: Well, first, I don't think -- it basically says that he's in defiance of 1441. That's what the resolution says. And it's hard to believe anybody is saying he isn't in defiance of 1441, because 1441 said he must disarm. And, yes, we'll call for a vote.
Q No matter what?
THE PRESIDENT: No matter what the whip count is, we're calling for the vote. We want to see people stand up and say what their opinion is about Saddam Hussein and the utility of the United Nations Security Council. And so, you bet. It's time for people to show their cards, to let the world know where they stand when it comes to Saddam.
This was a lie, he never called for a UN vote to invade iraq. This is not from a liberal blog, this is from the president's own web site.
http://www.whitehouse.gov/news/releases/2003/03/20030306-8.html