Mike Waltz, the former national security adviser who left his position in May in the wake of the Signal chat controversy in March, is facing a confirmation hearing Tuesday on Capitol Hill for his nomination as United Nations ambassador.

A confirmation hearing is underway for Trump's former national security advisor Mike Waltz, to be U.S. ambassador to the United Nations. He's facing questions from the Senate Foreign Relations Committee and is expected to be grilled over the Signal group chat controversy.

Mike Waltz, President Donald Trump’s nominee for ambassador to the United Nations, will face questioning from lawmakers after he was ousted as national security adviser.