Representative Ro Khanna has known Elon Musk for more than a decade, so he thought he should raise some concerns about the billionaire’s assault on the federal government where he would be sure to see them.

Democrats are turning their attention to the richest man in the world as a way to target Republicans and win back key voter groups

The party has struggled with how to respond to President Trump’s aggressive efforts to remake the federal bureaucracy and other controversies.