Tension between Mullin and White House appears to be growing, sources say

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President Donald Trump brought in Homeland Security Secretary Markwayne Mullin to lead a department at the forefront of his signature domestic policy.

DHS Secretary Markwayne Mullin Holds News Conference

Homeland Security Secretary Markwayne Mullin speaks in Washington on Friday. Jim Lo Scalzo / Bloomberg via Getty Images

July 23, 2026, 5:00 AM EDT

By Julia Ainsley and Gabe Gutierrez

Only four months into his role heading the Department of Homeland Security, there appears to be growing tension between Markwayne Mullin and the White House after some early missteps, according to a senior Trump administration official and a senior DHS official.

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