Trump claims they signify a ‘foreign invasion’ but experts say they’re flown by US citizens proud of their heritage

At the White House on Wednesday, the press secretary, Karoline Leavitt, told reporters Donald Trump’s decision to dispatch the military to Los Angeles had been triggered by something he’d seen: “images of foreign flags being waved” during protests over federal immigration raids.

Leavitt did not specify which images the president had been so disturbed by, but the fact that some protesters denouncing his immigration crackdown have waved Mexican, Guatemalan and Salvadorian flags, or hybrid flags that combine those banners with the American flag, has been taken as an affront by supporters of his mass deportation campaign.

The architect of that policy, Stephen Miller, has complained bitterly about flag-waving protesters on the streets of his Los Angeles hometown, and shared video of demonstrators on social media with the comment: “Look at all the foreign flags. Los Angeles is occupied territory.”

Trump himself even claimed, during his deeply partisan speech to soldiers at Fort Bragg on Tuesday, that his deployment of active-duty marines to the city was justified because of the protesters he called “rioters bearing foreign flags with the aim of continuing a foreign invasion”.