London Mayor Sadiq Khan says Trump's attacks on him are due to his ethnicity and religion

London Mayor Sadiq Khan has accused Donald Trump of repeatedly criticizing him because of his "ethnicity" and Muslim faith, comments likely to renew his long-running feud with the US president-elect.

The pair became embroiled in an extraordinary war of words during Trump's first presidency, initially sparked by Khan speaking out against a U.S. travel ban on people from certain Muslim countries.

Trump then accused Khan -- the first Muslim mayor of a Western capital when he was first elected in 2016 -- of doing a "very bad job on terrorism" and called him a "stone cold loser" and "very dumb."