Labour Leader Jeremy Corbyn gave an impassioned speech condemning racism in all forms and calling for peace in front of a London crowd on June 4, adding that he is "proud" of Sadiq Khan, the Muslim mayor of London.

"I'm proud our city has a Muslim mayor; that we can chase down Islamophobia, anti-Semitism, any form of racism within our society," Corbyn said.

"I want to work with every government around the planet to bring about a peaceful world where we don't solve our problems by going to war," Corbyn said, who has been Leader of the Opposition since 2015.

Trump and Khan's feud is long-standing: Khan commented that "Donald Trump’s ignorant view of Islam could make both our countries less safe," while Trump has called Khan a "stone cold loser."