Trump nominates Kirstjen Nielsen as Homeland Security secretary

U.S. President Donald Trump (R) speaks during the introduction of Kirstjen Nielsen as Secretary of Homeland Security nominee at the White House in Washington D.C., the United States, on Oct. 12, 2017. Trump on Wednesday nominated Kirstjen Nielsen, an aide to White House Chief of Staff John Kelly, to be Secretary of Homeland Security. (Xinhua/Ting Shen)