President Donald Trump held the first cabinet meeting of his new administration Wednesday, with Elon Musk speaking at the sit-down as the billionaire cost-cutting czar’s authority is challenged in court—and some Republicans raise alarm about his Department of Government Efficiency’s mass layoffs.

President Donald Trump will meet with his cabinet for the first time on Wednesday, along with Elon Musk, who has threatened to fire many of their workers under the directive of the Department of Government Efficiency.