President Donald Trump’s choice for the No. 3 post at the Pentagon faces a pivotal confirmation hearing this week. His foreign policy views have created divisions among the Republican senators tasked with advancing his nomination.

Elbridge Colby, tapped by Trump to be undersecretary of defense for policy, is set to be grilled Tuesday by the Senate Armed Services Committee as GOP senators seek assurances from the White House and Colby about his past comments on the Middle East, particularly Iran.