Kristi Noem, a Republican and Trump ally, has been confirmed as Secretary of Homeland Security. She will lead the agency responsible for national security and immigration enforcement.

The Senate voted on Saturday morning to confirm Kristi Noem as President Donald Trump’s Homeland Security secretary, installing a long-time Trump ally at the helm of an agency poised to play a central role in the president’s promised immigration crackdown.

The job has proved fiendishly difficult in the Trump era. During his first term, the president cycled through no fewer than six Homeland Security chiefs.