World leaders gather in New York every September for several days of speeches at the annual United Nations General Assembly, which on Tuesday begins its 80th session. Though it harbors deep mistrust of the United States, and President Donald Trump in particular, Tehran is increasingly concerned that mounting public anger over economic hardships could weaken the establishment. Tensions have heightened between Tehran and Washington since June, when the United States joined Israel and attacked Iranian nuclear sites during a 12-day war between Israel and Iran. The United Nations headquarters is located in Midtown Manhattan. "These measures send a clear message: the United States stands with the people of Iran in their pursuit of accountability and a better future,” he said.