A group of Trump supporters were forced to take shelter in a London bar Tuesday as a crush of protesters swept through the city.

The Metropolitan police corralled the crew of some 20 people, pulling them into the Lord Moon of the Mall pub on Whitehall Street as the heated mob shouted, “Nazi scum off our streets!,” the Independent reported.

Cops intervened amid a “verbal disagreement” between the supporters and anti-Trump protesters rallying against the president’s state visit to the UK. About a dozen officers stood guard outside with members of the pub’s security team.

Officers on horseback tried to break up demonstrators as they shouted “Police protect the fascists.” The crowd eventually retreated toward Trafalgar Square.

Police described the tense standoff as “a melee between opposing political groups — it is chaos.”

One Trump backer, wearing a red “Make America Great Again” hat, said he came out to defend free speech.

“As a president, he has a right to be here,” the 22-year-old former soldier, who would only identify himself as John, told the Independent. “It is a matter of free speech. These protesters are undemocratic.”

One person has been arrested, the Independent said.

Scotland Yard said 3,182 officers have been dispatched on the second day of Trump’s visit, which involved meetings with outgoing Prime Minister Theresa May at her official residence at 10 Downing Street.