Senior White House adviser Elon Musk said on Saturday that he believes the United States should leave the United Nations and the North Atlantic Treaty Organization—two of the world’s most important intergovernmental bodies.

Elon Musk, who holds no official cabinet position in the administration, wrote on social media that he agrees the United States should leave NATO and the United Nations. On Saturday, Musk quote-tweeted “I agree” to a post from someone who wrote, “It’s time to leave NATO and the UN.”

Tech baron Elon Musk backed calls for the US to withdraw from both NATO and the United Nations after months of occasionally badmouthing both international organizations.