President Donald Trump on Sunday said U.S. negotiators will communicate with their Iranian counterparts over the telephone instead of traveling abroad for talks to end the war.

The president elaborated on his decision over the weekend to cancel the U.S. negotiating delegation’s planned trip to Pakistan. Special envoy Steve Witkoff and Jared Kushner had been scheduled to visit the country, which has been a crucial mediator in peace talks seeking to end the war between Washington and Tehran.