WASHINGTON (CNN) -- First Lady Laura Bush acknowledged that she has found the Iraq war and its aftermath "wearing," but told CNN she fully agrees with the president that a troop withdrawal would be a "serious mistake."

"Of course it's wearing, worrying. There's no doubt about it, and I understand how the American people feel and that they feel like things aren't going like we want them to there," she said when asked by CNN's Larry King in an interview that aired Monday night if the war had worn her down.

"On the other hand I know how important it is for us to continue to help the Iraqis, and to leave now would be a serious mistake. And I really agree with the president on that," she added.

The First Lady also admitted to sometimes disagreeing with her husband but said the two rarely fight.

"We really don't anymore. I mean when we were newlyweds, I think we used to argue a lot," she said. "But now after almost 30 years of marriage, we really don't argue very much. Even though we have differences of course and see issues in different ways, I think we both really understand each other."

-- CNN Ticker Producer Alexander Mooney