Watch: Trump Addresses U.N. General Assembly

President Trump is set to speak Tuesday to the U.N. General Assembly in New York, amid escalating trade wars and growing calls by some Democrats for his impeachment over a conversation with a foreign leader.

The president's administration on Friday ordered new economic sanctions against Iran following an attack on a Saudi Arabia oil facility. American companies are also feeling the impact of the ongoing trade war with China. Trump last month announced the latest round of tariffs on the country, and it hit back with retaliatory tariffs on U.S. goods.

Over the weekend, a whistleblower drew attention to a call between Trump and Ukrainian president Volodymyr Zelensky in which Trump reportedly asked Zelensky to investigate Democratic opponent Joe Biden's son's business in Ukraine.

Larger questions about the U.S.'s role as a world leader also hang over the speech. Trump is expected to attempt to affirm that role, despite the tensions.