President Trump hosts the Global Call to Protect Religious Freedom event Monday at the United Nations in New York. 

The annual United Nations General Assembly kicks off Monday in New York, with more than 90 heads of state gathering at UN headquarters for a week's worth of meetings.

The assembly's first big event is the Climate Action summit, where UN Secretary-General Antonio Guterres has asked leaders to offer "concrete and transformative plans" to fight the climate crisis.

President Trump won't be there, though. He's skipping the climate summit to host a session on religious persecution.

Tuesday, the parade of speeches by world leaders begins, starting with Brazilian President Jair Bolsonaro.

Trump is scheduled to speak then as well.

Everyone will be watching to see whether Trump meets with Iranian President Hassan Rouhani, after tensions between the two countries flared up after the attack on the oil fields in Saudi Arabia.