http://www.breitbart.com/big-government/2015/03/30/ted-kennedys-real-legacy-50-years-of-ruinous-immigration-law/
George W Bush has a minor culpability. The Clinton administration that Hillary was an integral and defacto co president has the vast majority of responsibility for 9/11. Along with Ted Kennedy.
Bottom line is the illegals that committed 9/11 would not have been here if they had been deported after their visas ran out. In addition with proper vetting they would have never been given a visa to come to the United States.
Good link to Brietbart article on immigration:
If security was Bush’s Top Priority, 9 months was plenty.
Bush not only did nothing about illegal immigration after 9-11, he tried to amnesty all the illegals which led to even more coming here. Bush either learned nothing for 9-11 or did not care.