PORT-AU-PRINCE: Pressure is mounting on the man who claims to be Haiti's leader in the aftermath of the president's assassination with at least two other officials claiming to be the legitimate head of government amid a race to fill the political power vacuum. Interim Prime Minister Claude Joseph has pledged to work with the opposition and allies of President Jovenel Moïse who was killed on Wednesday at his private residence. He faces two rivals: Ariel Henry, whom Moïse designated as prime minister a day before he was killed, and Joseph Lambert, the head of Haiti's dismantled Senate.