This is not the first time Trump has stated this crap. It is silly. If he wants to blame a President he should blame Bill Clinton. 9/11 wasn't the first time they tried to take down the WTC - or at least part of it.
Uhh, Trump did blame Clinton....
Trump blames Bill Clinton for 9/11
http://thehill.com/policy/national-security/265664-trump-blames-bill-clinton-for-9-11