Kristi Noem
Kristi Noem to be Special Envoy for the 'Shield of the Americas' AFP News

US President Donald Trump has announced a cabinet reshuffle that will see Kristi Noem move to a newly created diplomatic role after being removed as Secretary of the US Department of Homeland Security (DHS). Trump confirmed on Thursday that Oklahoma Senator Markwayne Mullin will be nominated to lead the department, marking the first major personnel change of the administration's second term.

The transition is scheduled to take effect on 31 March 2026. Noem will take up a position titled Special Envoy for the 'Shield of the Americas', a regional security programme focused on cooperation across the Western Hemisphere. Mullin, meanwhile, is expected to assume leadership of the federal agency responsible for border enforcement and domestic security if his nomination is confirmed.

The personnel change follows a week of congressional hearings during which Noem faced questioning from Republican and Democratic lawmakers over immigration enforcement and the department's internal management. While the president praised her 'spectacular results' at the border, the announcement comes amid a partial shutdown of DHS caused by a funding impasse on Capitol Hill.

Transition to 'Shield of the Americas'

Noem's new role as Special Envoy for the 'Shield of the Americas' will centre on international security cooperation across North, Central and South America, AP News reported. The programme is intended to strengthen coordination on border enforcement, the disruption of narcotics cartels and the management of regional migration.

The initiative will operate as a diplomatic effort under the US Department of State, signalling a shift in Noem's responsibilities from domestic enforcement to regional engagement. In a statement following the announcement, she said she would work closely with Secretary of State Marco Rubio and Secretary of Defence Pete Hegseth to address transnational security threats.

Nomination of Markwayne Mullin

To replace Noem at the DHS, Trump has selected Senator Markwayne Mullin, a Republican from Oklahoma and a member of the Cherokee Nation. Mullin previously served for a decade in the House of Representatives before his election to the Senate in 2022 and has been a vocal supporter of the administration's immigration policies.

The nominee, a former professional mixed martial arts fighter and business owner, would oversee a department of roughly 260,000 employees, according to TIME. If confirmed by the Senate, Mullin would assume responsibility for agencies including Customs and Border Protection, the Federal Emergency Management Agency and the US Coast Guard.

Speaking to reporters outside the Capitol, Mullin said he looks forward to working with the White House on border security and addressing what he described as 'migrant crime'.

Impact on Administration Policy

The leadership change at DHS comes during ongoing debate in Washington over immigration enforcement. Reuters reported that the administration has proposed expanded law-enforcement hiring and deportation policies.

Critics of the administration, including Senate Minority Leader Chuck Schumer, have argued that the personnel change does not address what they describe as 'much deeper' policy challenges within the department. Supporters of the administration have characterised the reshuffle as an effort to align personnel with both domestic enforcement priorities and regional security efforts.

Under federal law governing executive branch vacancies, Mullin may be permitted to serve as acting secretary while his nomination proceeds through the Senate confirmation process. The Senate Judiciary Committee is expected to schedule hearings on the nomination in the coming weeks.

Regional Security Focus

The 'Shield of the Americas' programme involves cooperation with governments across Latin America on migration enforcement and organised crime.

Officials said the programme will include intelligence sharing, border monitoring and joint operations targeting trafficking networks. The White House said additional details will be announced during an event in Florida later this week.

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