On Thursday, President Trump fired Kristi Noem, his secretary of homeland security, whose agency is at the center of his second-term agenda.

Hamed Aleaziz, who covers the department, explains how Ms. Noem ended up losing the president’s trust.

Guest: Hamed Aleaziz, who covers the Department of Homeland Security and immigration policy in the United States for The New York Times.

Background reading:

Bulletproof vests and Rolex watches: the rise and fall of Kristi Noem.
Mr. Trump said he would replace Ms. Noem with an Oklahoma senator, Markwayne Mullin.

Photo: Nicole Hester/USA Today Network, via Reuters

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