washington chris christie close ally republican presidential nominee donald trump distance tuesday trump feud muslim family slay u.s. army captain accord politico christie governor new jersey say criticisms family captain humayan khan kill iraq 2004 inappropriate see mr. khan speech dnc say father imagine pain lose child circumstances say christie endorse trump end white house bid accord politico quote christie comment news conference new jersey state house trenton trump ally christie call criticisms slay soldier 's family 'inappropriate