President Donald Trump's confrontation with Maine's governor over transgender athletes captured the conundrum many Democratic governors are facing in the Republican's second term.

Janet Mills, who has a long history of facing tough guys in the courtroom and in politics, finds herself in an unprecedented moment with the nation watching.

Who and what will he target next, and what will he do?” Maine Governor Janet Mills said. “In America, the President is neither a King nor a dictator, as much as this one tries to act like it – and it is the rule of law that prevents him from being so.