Even IF (that little word, along with woulda, shoulda, coulda) the administration had information that there would be hijacks, and assume further that the information said they would crash it into a building, what could the administration have done? No one has asserted that there was information that the target was the Trade Center (used to work there by the way). So, the only alternative would be to ground all aircraft for some indeterminate period of time. Don't think so. None of the information supposedly had enough detail as to target and time frame to expect any response.
Yes, Democrat troublemaking. Maybe they should look in the mirror. FDR had much more detailed information, from reliable sources. Oh, yes, I know, that's different.