Mr. Lander, the New York City comptroller who is running for mayor, was handcuffed as he tried to steer a man past Immigration and Customs Enforcement officers.
He will appear on Tuesday evening in Hartford, Conn., alongside Heather Cox Richardson, a writer, at a time of deep volatility for his party, the country and the world.
Iranian officials have warned that U.S. participation in an attack on its facilities will imperil any chance of the nuclear disarmament deal the president insists he is still interested in pursuing.
The administration gave the nations 60 days to fix concerns, according to a State Department cable. The president already imposed a full or partial ban on citizens of 19 countries.
The Republican senator from Utah suggested in social media posts that the killings were the work of "Marxists," and mocked Minnesota's Democratic governor. He later issued a more sober condemnation of the violence.
President Trump appointed her to clinch a conservative legal revolution. But soon after arriving at the Supreme Court, she began surprising her colleagues.