I did a fair amount of online research into this before posting. I saw both sides of the argument expressd.

Yes, I saw it live on TV that morning and I swallowed the government line that the planes brought down the towers. But thinking back, there was an awful lot of concrete DUST being generated at the base of the towers. I remember firemen at the base being covered with concrete DUST. Hard to explain that much dust from a simple collapse of a concrete building. And the collapse was almost straight down; very neat job.

So Could Bush have done it? Well let’s look at the planning that would have been needed to make this happen as the truthers say it did.

Bush was sworn in as president on January 20, 2001. We know the attacks occurred on September 11, 2001, less than 8 months in office or just 233 days. On average, it takes approximately 6 months to study prints, put together a plan for demolition, execute the planned setup, then the actual demolition. At 439 feet (134 m) and 2,200,000 square feet (204,000 m2), the J. L. Hudson Department Store and Addition is the tallest steel framed building and largest single structure ever imploded, and this project took 8 months from the beginning to implosion day. The tallest demolished building( non-explosive demolition) was the 47-story Singer Building in New York City, which was built in 1908 and torn down in 1967-1968 to be replaced by One Liberty Plaza.

Now the actual prep work for both the Twin Towers and WTC 7 would have to have been done in 233 days, there are only a handful of implosion demolition companies out there, and they ALL say 233 days would not be enough time. But for the sake of this discussion, let’s say it is enough time. With the Approximately 50,000people who worked in the Twin Towers, the addition 5,000 more in WTC 7, none of them noticed workers running cables all throughout the buildings and running them to a safe location outside from which to detonate. Let’s say no-one seas the men running the cables, you cannot just lay the explosive anywhere. It must be attached to the support columns at the appropriate places. Now when these high rises are built, these steel risers are usually boxed out so as to not be exposed. So there would have to be a decent amount of demolition to expose the steel risers so the explosives can be properly attached.And yet you expect us to believe that all that occurred without 55,000 plus people seeing any of it take place.

Now Bush would have to recruit people willing to die in order to make the attacks by planes look real. So, He goes out to recruit these 19 people, bring them to the US, and help them plan to take over several planes.So since the majority of these 19 terrorists came to the US during the Clinton administration, Bush would have to now plan make sure he became President. So he set his plan in motion to make sure all the states would vote as they did, and that it would come down to Florida. That way he could count on his brother to secretly punch enough chads to make sure his brother got elected. I do not know about you, but my head is spinning already from all this planning. The 19 hijackers entered the United States a total of 33 times beginning in 1994.They arrived through ten different airports, though more than half came in through Miami, JFK, or Newark. The four pilots passed through INS and Customs inspections a total of 17 times before 9/11.Hanjour came to the United States to attend school in three stints during the 1990s.His final arrival was in December 2000, through the Cincinnati/Northern Kentucky airport.The other three pilots, Atta, al Shehhi, and Jarrah, initially came in May and June 1997.They arrived for the last time between May and August 2001. All 4 pilots took Jet flight training in a flight school in Florida. They took courses on and off for 2 years, but spent the last 6 months prior to the attacks on heavy simulator use. So the plan Bush hatched is coming together. He has recruited his attack crews, he has the demolition prep in full swing, and he rigged the primaries and the election to guarantee he was President when this happened.

...i've always thought popular mechanics did a very enlightening study on the subject.