It is unclear how Waltz would approach the job. Trump’s first nominee, Rep. Elise Stefanik, had built a track record in Congress of criticizing the U.N. She vowed during her confirmation hearing in January to combat what she called antisemitism at the world body and lead a review of U.S. funding.

Mike Waltz, President Trump's former national security adviser, testified Tuesday at his Senate confirmation hearing to be U.S. ambassador to the United Nations.