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President Bush's last-minute decision to hold a live news conference in prime time tonight is wreaking havoc on Fox's Must-See Tuesday schedule. The network is moving tonight's performance edition of American Idol to Wednesday at 8 pm/ET. As a result, Idol's results show shifts to Thursday at 8 pm/ET (opposite Survivor!), leading into Tru Calling (8:30-9:30) and a repeat Simpsons (9:30-10). Tonight's regularly scheduled 24, meanwhile, will air Sunday at 9 pm/ET against The Sopranos on HBO and Alias on ABC. Elsewhere, NBC is bumping tonight's scheduled season finale of Happy Family to next week (say it ain't so!) and ABC and CBS are going with an all-repeat lineup.