White House counselor Kellyanne Conway Kellyanne Elizabeth ConwayGeorge Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' Juan Williams: Swamp creature at the White House Oversight Democrats press for probe into possible Hatch Act violations MORE on Sunday said she thinks Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE will try to combat the issue of leaks as he assumes leadership of the State Department.

“He has made very clear that people at State should expect major changes coming, and I would assume leaking is one of them,” Conway told Fox News’s “Media Buzz" in a Sunday interview.

Details of Trump’s calls with the leaders of Australia and Mexico leaked last week, prompting uproar over the tone and content of the conversations and a promise from the White House that it would investigate the leaks.

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Conway insisted members of the Trump Administration are not “leakers.”

“It certainly isn’t Secretary of State Rex Tillerson and his close advisers,” she said.

In his first speech to State Department employees on Thursday, Tillerson said staff members should use their “natural and well-developed skills to adapt to changes here at home.”

“As secretary, I will deploy the talent and resources of the State Department in the most efficient ways possible,” Tillerson said.

“That may entail making some changes to how things are traditionally done in this department. Change for the sake of change can be counterproductive, and that will never be my approach.”