Firing of US homeland security secretary is first major personnel shakeup of Trump’s second term – key US politics stories from 5 March at a glance

Kristi Noem is out of a job.

Donald Trump on Thursday announced he was replacing his embattled homeland security secretary, capping weeks of bipartisan complaints about her leadership after immigration agents killed two US citizens and reports emerged that she was involved in a personal relationship with a top deputy.

The president made it public in a post on Truth Social, in which he said Markwayne Mullin, a Republican Oklahoma senator, would take over from Noem starting on 31 March.

But it appears Noem has another government job lined up. Trump said she would become special envoy for “the Shield of the Americas”, a security initiative Trump said he planned to announce over the weekend.