Secretary of State Rex Tillerson on Sunday blasted Sebastian Gorka for criticizing President Donald Trump's foreign policy goals, declaring the ex-national security aide is "completely wrong."

In an interview on Fox News Sunday, Tillerson rebuked a scathing resignation letter Gorka wrote after Trump's Afghanistan speech, which was posted by The Federalist.

In the letter, Gorka accused Trump of caving into "forces that do not support the [make America great again] promise" that Trump made to his supporters during the 2016 campaign.

"This was made patently obvious as I read the text of your speech on Afghanistan this week," Gorka wrote. "The fact that those who drafted and approved the speech removed any mention of Radical Islam or radical Islamic terrorism proves that a crucial element of your presidential campaign has been lost."

Tillerson told Fox News host Chris Wallace, "I think he's completely wrong."

"It shows a lack of understanding of the president's broader policy when it comes to protecting Americans at home and abroad from all acts of terrorism," Tillerson said.

"Terrorism has manifested itself in many types of organizations. The president has charged us to develop policies and tactics both diplomatically and militarily to attack terrorism in its many forms, wherever it exists in the world, and wherever it might present a threat to the homeland or Americans anywhere. This means that we need to develop techniques that are global in their nature."

Gorka's departure from the White House was reported Friday night, a week after the exit of ally and White House chief strategist Stephen Bannon.