London, June 20 (RHC)-- London Mayor Sadiq Khan has called Donald Trump a "poster boy for racists," after the U.S. president renewed his attacks on the Muslim mayor, blaming him for a spate of attacks in the British capital.

Trump called Khan a “disaster” who should be thrown out of office, while re-posting a Twitter message written by right-wing British columnist Katie Hopkins on a series of shootings and stabbings that killed four people in London over three days.

The mayor responded directly to Trump, saying it was “remarkable that you've got the president of the USA amplifying the tweets of a far-right activist, amplifying a racist tweet."  And Trump added: ""He's now a poster boy for the far-right movement and that should cause us huge concern."

"It's for Donald Trump to answer the question why he's obsessed with me; it's for Donald Trump to answer the question why he amplifies the tweets of far-right activists, why he amplifies racist tweets,” he said.

Responding to Trump, UK home secretary, Sajid Javid, said the U.S. president should “stick to domestic politics.”  Khan, London’s first Muslim mayor, has been attacked by Trump since some three years ago, when Khan criticized then-candidate Trump for his proposed plan to ban foreign Muslims from entering the United States.

Earlier this month, Trump reignited feud with Khan immediately after landing in London for an official visit.  He called Khan in a Twitter message: “A stone cold loser" who has "done a terrible job.”