California Gov. Jerry Brown has signed an order authorizing 400 state National Guard troops to be deployed as part of President Donald Trump’s order for troops to be sent to the U.S. border with Mexico.

Mr. Brown’s order came after days of discussions with the Trump administration about what role California troops would serve to help the U.S. Border Patrol. The Democratic governor last week said he would send 400 troops but balked at allowing California troops to do jobs that would support immigration enforcement.

“We...