In the national struggle over U.S. House control, perhaps no politician has more at stake than the California governor, who has emerged as the leading Democratic adversary to President Donald Trump in what many see as a lightly masked trial run for his own future White House bid.

Gavin Newsom's press office has been mocking President Trump with tweets in his style over the past few weeks.

California has an overwhelmingly Democratic delegation in Congress. Gov. Newsom’s plan could give his party five more seats and offset a Texas gerrymander.