Donald Trump has said undocumented immigrants were "poisoning the blood of our country" during a speech in New Hampshire. The Republican presidential frontrunner repeated language that had previously been criticised as xenophobic and echoing Nazi rhetoric. Mr Trump made the comments during a campaign event where he railed against the record number of migrants attempting to cross the US border illegally. He has promised to crack down on illegal immigration and restrict legal immigration if elected to a second four-year term in office. Read more: A 'very close' US election is less than a year away: What will decide it?...