context: On the morning after his re-election, US President Joseph Staton (Dennis Quaid) decides to read the newspaper for the first time in four years. This starts him down a slippery slope. He begins reading obsessively, reexamining his "black-and-white" view of the world in a more "gray-seeming" way, and holing up in his bedroom in his pajamas. Frightened by the President's apparent nervous breakdown, his Chief of Staff (Willem Dafoe) pushes him back into the spotlight, booking him as a guest judge on the television ratings juggernaut (and the President's personal favorite), the weekly talent show American Dreamz, a show similar in format to the modern-day American Idol. America cannot seem to get enough of American Dreamz, hosted by self-aggrandizing, self-loathing Martin Tweed (Hugh Grant), ever on the lookout for the next insta-celebrity. His latest crop of hopefuls includes Sally Kendoo (Mandy Moore), a conniving steel magnolia with a devoted, dopey veteran boyfriend William Williams (Chris Klein), and Omer Obeidi (Sam Golzari).
  Because Omer's mother died in the Middle East in an American attack, he joined a group of jihadists. He was an actor in an instruction film for terrorists, but he was too clumsy, and his interest in show tunes was frowned upon. Therefore, he was sent to the U.S. to await further instructions, but the leaders expected they could not use him. He moved to Southern California to live with his extended family there, including his effeminate cousin Iqbal (Tony Yalda) and Shazzy (Noureen DeWulf). Iqbal hoped to be selected to participate in American Dreamz, but in a misunderstanding, Omer was selected instead. Iqbal becomes angered by this at first but later agrees to help Omer win and makes himself his manager.
  Omer's terrorist organization now sees an opportunity: Omer is instructed to make it to the finale, and kill the President in a suicide attack. He succeeds in getting to the finale. Security is bypassed by assembling the bomb after the security check, in the toilet, from small parts smuggled in (the smaller pieces of explosive are disguised as chewing gum). Omer agrees, but changes his mind and disposes of the bomb in the trash can.
  Sally is the other finalist. Earlier in the film, she had dumped William because she believed that her life would've gone nowhere if she still had him for a boyfriend and that he'd only drag her down. This drove William to join the army, only to be wounded in Iraq and sent back to the U.S. For the purpose of the show and at the insistence of her agent, Chet Krogl (Seth Meyers), Sally has to pretend that she still loves William. On the eve of the American Dreamz finale, William proposes to Sally, which she rejects until Chet decides to boost Sally's popularity and chances of winning the show by asking William to do the proposal on air. However, William witnesses Sally having sex with Martin, and is furious. When he throws out the engagement ring, he finds the bomb Omer tossed in the trash can. He then comes out on stage and threatens to detonate it. While the other people evacuate, William starts singing and Martin, who refuses to let go of the camera, films it. As William reaches the end of the song, he detonates the bomb by walking into the camera, killing both himself and Martin. The film then cuts to shots of people dialing up their cell phones to vote in for the winner. It is eventually revealed that William Williams was voted the surprise winner of American Dreamz.
  The epilogue reveals what each of the characters went on to do after the end of last season. Omer went on to become a successful star of his own Broadway revue, where he is shown performing a scene from the musical Grease. The President makes his wife his new Chief of Staff. And Sally Kendoo becomes the new host of American Dreamz.
question: Who hosts the weekly talent show contest?
answer: Martin Tweed