“Who is in charge at the United Nations?” Trump wrote in his book, "Think Like a Millionaire." "I think it's emblematic of how feckless the UN has become as an organization," Rubio said of the decades-old incident. "So, again, the UN has a lot of potential, but it's not living up to it right now." On Tuesday, Trump is expected to share his "vision for the world", according to CNN. Marco Rubio previews Trump's speech to the UN: "You can anticipate that the president will point to his own history with the UN going back to his time as a developer.