Trump nominates Kirstjen Nielsen as DHS secretary

Nielsen boards Air Force One. Photo: Alex Brandon / AP

President Trump has nominated Kirstjen Nielsen — Chief of Staff John Kelly's deputy at the White House and the Department of Homeland Security — to be the next Secretary of Homeland Security.

The backdrop: Elaine Duke has been serving as acting secretary since Kelly stepped down to take the White House gig in July. Nielsen, who is a cybersecurity expert, was Kelly's pick to run the department.