Secretary of State Rex Tillerson is "not at all" concerned about his ability to act independently of President Trump after his boss fired FBI Director James Comey last week.

He was asked about during an interview on NBC News' "Meet the Press with Chuck Todd," in a preview clip released Saturday.

"And finally, did the firing of F.B.I. Director Comey shake your concern about whether — how much independence the president will give you?" host Chuck Todd asked.

"Not at all, Chuck. I have a great relationship with the president," Tillerson replied. "I understand what his objectives are. When I'm not clear on what his objectives are, we talk about it."

Trump fired Comey on Thursday, and some critics of the decision are concerned the president did it because of the FBI's investigation into possible ties between Trump campaign's and Russia.

Tillerson added that he is "devoted" to helping the president achieve his goals and that he has to earn Trump's confidence every day in how he leads the State Department.

"What's the line between service to the president and service to the country, sir? For you," Todd asked.

Tillerson replied that he would never betray his own morals.

"Well, I will never compromise my own values, Chuck. And so that's my only line. And my values are those of the country," he said.

The full interview will air on NBC on Sunday morning.