US Homeland Security Chief Kirstjen Nielsen resigns

US Homeland Security Secretary Kirstjen Nielsen has announced her resignation in a move connected by observers to the president’s anger over Central American border crossers. She used to be the front-line defender of the administration’s controversial immigration policies. Her resignation has marked the end of a tortured relationship with Donald Trump, who reportedly blamed her for an increase in the number of migrants who cross the southern border and felt she wasn’t tough enough to implement his crackdown.