1. The head of the N.R.A., Wayne LaPierre, above, offered a fierce defense of the Second Amendment in his first public remarks since the massacre in Parkland, Fla. He warned against a socialist plot to “eradicate all individual freedoms” at a Conservative Political Action Conference gathering in Maryland.

President Trump endorsed arming teachers to protect students from school shootings. He said that teachers who were qualified to handle a weapon would get a bonus, and that he would devote federal money to training them.