During a May 2017 NATO summit, Trump pushed his way past the prime minister of Montenegro to stand in front of the group of leaders.

Trump has also referred to the people of Montenegro as “very aggressive,” and warned that the Balkan country of under 700,000 people could ignite World War 3.

The New York Times – Trump Appears to Push Aside the Leader of Montenegro
Associated Press – Trump pushes aside Montenegro leader who calls it natural
BBC News – Trump pushes past Montenegro’s PM