In 2018, he was removed from the 2018 Russia–United States summit press conference, prior to Trump and Putin's arrival in the room, when he held a sign saying, "Nuclear Weapon Ban Treaty," which the Russian authorities called a "malicious item". A CBS News reporter stated that he had been "heckling" reporters and two security detail members. Husseini said he had hoped to ask Trump a question regarding the first legally binding international agreement to prohibit nuclear weapons, with the goal of their total elimination.