Since U.S. President Donald Trump made his debut at the United Nations a year ago pushing an "America First" policy, he has quit the Iran nuclear deal, the U.N. Human Rights Council and lashed out at some of the closest allies of the United States.

Next week at the United Nations, Trump plans to stay on message, touting his drive to protect U.S. sovereignty before world leaders, some of them worried about America's commitment to the multilateralism that has governed the United Nations since the end of World War II.

"It is not saying multilateralism can't work. But it's saying sovereignty is a priority over all of that," U.S. Ambassador to the United Nations Nikki Haley said, previewing Trump's address on Tuesday at the annual U.N. General Assembly.