U.S. President Donald Trump addresses the 80th United Nations General Assembly, in New York City on Tuesday. Trump offered his U.S. immigration crackdown as a case study for what other world leaders should do to curb mass migration that he says is altering the fabric of nations. But in Tuesday's speech, Trump mocked NATO allies for not shutting down purchases of Russian oil and said he would impose strong economic measures against Moscow. On the Israel-Palestinian conflict, Trump rejected efforts by world leaders to embrace a Palestinian state, a move that faces fierce resistance from Israel. "These are the two things I got from the United Nations - a bad escalator and a bad teleprompter," Trump said, noting that Melania Trump nearly fell when the escalator stopped abruptly.