President Trump is joined by Homeland Security Secretary John Kelly during a visit to the Department of Homeland Security on January 25. A prominent advocate of ending U.S. birthright citizenship is in line to join the Trump administration in an immigration-related position at the Department of Homeland Security, according to two former U.S. officials informed of transition changes by department personnel. Jon D. Feere has been a legal policy analyst for the Center for Immigration Studies, a conservative group that calls for added immigration restrictions.