“You already know Donald Trump. He is unfit to lead. Watch him. Listen to those who know him best. He tried to subvert an election and remains a threat to democracy. He helped overturn Roe, with terrible consequences. Mr. Trump’s corruption and lawlessness go beyond elections: It’s his whole ethos. He lies without limit. If he’s re-elected, the G.O.P. won’t restrain him. Mr. Trump will use the government to go after opponents. He will pursue a cruel policy of mass deportations. He will wreak havoc on the poor, the middle class and employers. Another Trump term will damage the climate, shatter alliances and strengthen autocrats. Americans should demand better.