Former DHS personnel chief calls Trump 'dangerous' to America A former senior official in the administration of President Trump is supporting Democratic Challenger Joe Biden as the Democratic National Convention gets under way. Miles Taylor, who served as chief of staff for Homeland Security Department Secretary Kirstjen Nielsen in Trump administration from 2017 to 2019, backed the former vice president and presumptive Democratic candidate on Monday. SEVERAL REPUBLICANS TO SPEAK AT FIRST NIGHT DEMOCRATIC CONVENTION Taylor, who called America's president "dangerous" and accused Trump of using his office 's powers repeatedly for political purposes, exclusively told Fox News that "this won't be the last one the president hears of me." Taylor, a long-time Republican who worked as an adviser to the then GOP-controlled House Homeland Security Committee before moving to the Homeland Security Department as a political appointee in 2017, declared his