clinton's achilles heel, her use of a private e-mail server. >> if she were to win, it would create an unprecedented constitutional crisis. >> reporter: the e-mail controversy is central to the closing message trump is toting as he zigzags across the country, visiting at least ten states between now and monday, four to crucial battleground states. the states trump can't hit will see this. >> our movement is about replacing a failed and corrupt political establishment with a new government controlled by you, the american people. >> reporter: an unconventional $4 million two-minute long ad. trump's final national message will run during ncaa, nfl and nascar events this weekend. and during major primetime programming before tuesday. >> the only thing that can stop this corrupt machine is you. the only force strong enough to