President Trump's former campaign manager Corey Lewandowski on Thursday said those who work in the White House should fully support Trump's "aggressive agenda."

"Any person who serves in this administration, whether it’s in the White House or in some other department, that isn’t fully supporting the president’s agenda should not be there. It’s very simple," Lewandowski said Thursday on ABC's "Good Morning America."

Lewandowski said if people don't believe the president is pursuing the right agenda, then they "have the prerogative as a staff member to leave."

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"And you should be fired, candidly, if you’re speaking to the press outside of the course of the individuals who are authorized to speak to the press," he said.

Lewandowski was further asked whether he believes there is a loyalty problem inside the White House.

"There are a number of people who the president is next to who are exceptionally loyal to him," he said.

"And if anybody isn't loyal to him, they shouldn't be there."

Lewandowski said Trump has an aggressive agenda, noting he is continuing to "do the peoples' business" and "change Washington."

He also said recent reports that he's been spotted at the White House with more frequency were just visits. He denied any plans to return as a member of Trump's administration and said he is just a "visitor."

The comments come amid a series of controversies. Trump last week fired FBI Director James Comey.

The New York Times later reported that the president had asked for Comey's loyalty multiple times during a dinner in January. Comey reportedly refused to assent to Trump's request and only pledged "honesty." The White House denied the report that Trump asked Comey to pledge his loyalty to him.