“Al Qaeda’s base of operations”, he said, “was in Afghanistan, where they were harbored by the Taliban”, who “refused to turn over Osama bin Laden”.
In fact, the Taliban offered to either try bin Laden in their court system or hand him over to a third country if the U.S. provided evidence of his involvement in the 9/11 attacks. The evidence, however, was not forthcoming, and so the Taliban did indeed refuse on that basis.
The FBI has admitted there is no actual evidence that Osama had anything to do with 9-11, and he himself denied involvement before he died. Osama's official FBI wanted poster does not list 9-11 as one of his crimes.