'I don't know who the Proud Boys are' - Trump

Donald Trump has said a far-right group should "stand down" and let law enforcement do their work, after his refusal to condemn white supremacist groups in the US presidential debate sparked a backlash.

Mr Trump said "I don't know who the Proud Boys are" on Wednesday - despite urging them to "stand back and stand by" on Tuesday night.

Who are Proud Boys and antifa?