Eric Swalwell, a seven-term Democratic US representative known for his pugnacious and persistent opposition to Donald Trump , announced on Thursday night he will run for governor of California.

His announcement comes shortly after the billionaire environmental activist Tom Steyer entered the already crowded field vying to succeed Gavin Newsom , who is coming to the end of his term limit.

A former Alameda county prosecutor, Swalwell, 45, rose to prominence through his clashes with Trump, a profile that could bolster his appeal among Democratic voters who in November overwhelmingly approved a new congressional map pitched as a way to check the president’s power before next year’s midterm elections.

Swalwell briefly sought the 2020 Democratic presidential nomination and later serve

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