Trump says he is replacing Kristi Noem as Homeland Security Secretary

Ms Noem is the first Cabinet secretary to leave during Mr Trump’s second term.

Kristi Noem is being replaced as US Homeland Security Secretary, Donald Trump said (J Scott Applewhite/AP)

US president Donald Trump has said he is replacing his embattled Homeland Security Secretary Kristi Noem and will nominate in her place Oklahoma Republican Senator Markwayne Mullin.

Mr Trump made the announcement on social media on Thursday, two days after Ms Noem faced a grilling on Capitol Hill from Republican members as well as Democrats.