The Trump administration says it will send 2,000 National Guard troops to Los Angeles after two days of isolated clashes between federal immigration agents and protesters.

But sending in the National Guard without a governor’s consent is extremely rare. The most recent comparable example comes from 1965, when President Lyndon Johnson federalised the Alabama National Guard to protect civil-rights marchers from segregationists.

President Donald Trump says he’s deploying 2,000 California National Guard troops to Los Angeles to respond to immigration protests, over the objections of California Gov. Gavin Newsom