CIA Director Mike Pompeo’s emergence as the next secretary of state foreshadows a toughening U.S. position on the Iran nuclear deal, administration critics and allies agree.

President Trump fired Secretary of State Rex Tillerson and tapped Pompeo to be the nation’s lead diplomat in one motion Tuesday, just days after agreeing to meet North Korean dictator Kim Jong Un to discuss a rollback of the regime’s nuclear weapons program. But Pompeo’s arrival might have a more immediate influence on a parallel nuclear issue: the negotiations that will determine whether the U.S. withdraws from the Iran nuclear deal in May.