U.S. Ambassador to the United Nations Mike Waltz was interrupted during a speech this week and called out for his involvement in a leaked Signal group chat.

Waltz spoke to the United Nations General Assembly on Tuesday, ahead of a vote on a resolution to condemn the U.S.’s economic restrictions on Cuba. As Waltz defended his nation’s position, Cuban Foreign Minister Bruno Rodriguez interrupted his speech with a “point of order,” and slammed the ambassador’s remarks as “uncivilized, crude and gross.”

He then appeared to call out Waltz’s involvement in a group chat with other Trump administration officials on the messaging app Signal, which was leaked earlier this year.

“Mr. Waltz, this is the United Nations General Assembly,” he said. “It is not a Signal chat. Nor is it the House of Representatives.”