Trump pushes aside Montenegro Prime Minister Dusko Markovic during a gathering at NATO's new headquarters in Brussels, Belgium, on May 25, 2017.
The president's behavior with foreign dignitaries was often called into question: a photo of world leaders staring him down at the 2018 G-7 summit went viral; he reportedly kept Queen Elizabeth II waiting for tea and at one point turned his back on her during their July 2018 meeting; and he had a second, previously undisclosed meeting with Russia's Vladimir Putin during the 2017 G20 summit. He also drew the ire of activists like climate change advocate Greta Thunberg, who stared him down during a 2019 United Nations meeting in New York City.