Mr. Schiff, who led the first impeachment trial of President Donald J. Trump and later served on the House panel investigating the Capitol riot, will seek the seat held by Senator Dianne Feinstein.
At an event in Southern California, the president says his administration is working to keep costs down and warns that Republicans will drive prices higher if they gain power.
“I don’t hear anything about the other national issues we’re focusing on in Washington,” a congressman said. A driver put it succinctly: “I’m really unhappy.”