Rosie O'Donnell has never been one to shy away from speaking her mind, but her latest controversial topic of conversation on 'The View' brought up a taboo that most daytime talk shows would never go near – the possibility of a conspiracy on 9/11.

On Thursday’s show, during a discussion on the war on terror and the prospect of war in Iran, O’Donnell veered into the theory that World Trade Center 7, which fell hours after the Twin Towers, was possibly destroyed purposely by explosives.

"I do believe that it was the first time in history that fire has ever melted steel," O'Donnell said when questioned on whether she thought the government was behind the collapse of WTC 7. "I do believe that it defies physics for the World Trade Center tower 7, which collapsed in on itself -- it is impossible for a building to fall the way it fell without explosives being involved. Miraculously, the first time in history steel was melted by fire," she said.

Her 'View' co-host Elizabeth Hasselbeck, who has been known to go head-to-head with a conservative counterpoint to Rosie's left-leaning opinions, listened as O'Donnell sold her case for a conspiracy theory. O'Donnell then asked: "to say that we don't know that it imploded ... is beyond ignorant. Look at the film, get a physics expert from Yale, from Harvard, pick the school. It defies reason. Imagine if somebody could convince you of that?"

Hasselbeck kept her cool, replying "If someone could sit here and prove that to me, I would open my mind to that."

Breaking the tension, but still keeping things politically charged, co-host Joy Behar wrapped up the segment with an anti-Bush zinger of her own, saying "Wait a second, Bush went to Yale, how good could they be?"

The exchange follows a recent blog post by O'Donnell dealing with the same subject.