Homeland Security Secretary Kristi Noem was in Los Angeles Thursday morning providing an update on immigration operations and protests in the area, when she was interrupted by Democratic Sen. Alex Padilla,

“I was there peacefully. At one point I had a question, and so I began to ask a question,” Padilla said in his first public remarks following the incident.

Some 700 Marines will be on the streets by Thursday or Friday, the military said, to support up to 4,000 National Guard troops in protecting federal property and federal agents, including on immigrati...