On Monday, The New York Times and others reported that Katie Rich, a staff writer at Saturday Night Live, had been suspended indefinitely by N.B.C. for sending out a tweet mocking President Donald Trump’s youngest son, Barron. The tweet read: “Barron will be this country’s first homeschooled shooter.” Rich has since deleted it. She also tweeted out an apology, which said: “I sincerely apologize for the insensitive tweet. I deeply regret my actions & offensive words. It was inexcusable & I’m so sorry.”