President Barack Obama will deliver his first speech to the U.N. General Assembly on Wednesday and lay out his foreign policy vision.

The nuclear dispute with Iran and the Afghanistan war will be among the top issues as Obama begins three days of U.N. meetings on Tuesday.

Obama will also lead a summit of the Group of 20 biggest economies on Thursday and Friday in Pittsburgh.

He has made major strides toward keeping his pledge to restore US economy during the financial crisis.

Obama was traveling to New York City later on Monday for the start of his biggest week on the world stage.