The seven-term Democrat is known for his pugnacious and persistent opposition to Donald Trump

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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.