WASHINGTON (AP) -- Mike Waltz painted an image for lawmakers Tuesday of what the United Nations would look like as the U.S. -- its largest donor -- reviews its support, opting to go "back to basics" under a Trump administration push to "make the U.N. great again." During his Senate confirmation hearing to be U.S. ambassador to the United Nations, Waltz echoed the priorities of his bosses -- President Donald Trump and Secretary of State Marco Rubio -- of pursuing major reforms to the 80-year-old world body. It was the first time senators could grill Waltz since he was ousted as Trump's national security adviser in May after he mistakenly added a journalist to a private Signal chat used to discuss sensitive military plans. He denied Tuesday that he was removed from the post, while laying out his plans to bring "America First" to the U.N.