By using her husband as a campaign surrogate, and simultaneously (correctly) calling Trump sexist, Hillary Clinton has opened a dangerous door, writes Ruth Marcus in the Washington Post.

Into this gender minefield lumbers Trump, characteristically unbound and deploying a weapon that none of Clinton’s Democratic opponents, past or present, has dared to mention. He played the Bill Card.

Trump tweeted on Sunday: “Hillary Clinton has announced that she is letting her husband out to campaign but HE’S DEMONSTRATED A PENCHANT FOR SEXISM, so inappropriate.”

Donald Trump—crude and vulgar as he may be—has a point about Hillary playing the “woman’s card” while her husband has preyed on women, especially in the workplace. “It should be no surprise that Trump has barged right through it.” Read more here.