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I saw it on the news more than once, and many saw it in person - in Jersey City, Patterson, Brooklyn and elsewhere. They have reported these sightings.
Even the Washington Post reported it (for some reason, a week later on 09/18), saying this:
"In Jersey City, within hours of two jetliners’ plowing into the World Trade Center, law enforcement authorities detained and questioned a number of people who were allegedly seen celebrating the attacks and holding tailgate-style parties on rooftops while they watched the devastation on the other side of the river."
Sorry, Mitt, but the charge doesn't hold water.
;Kudos to Mr. Trump. He saw what he saw and so did I.