Weekend TV watch

President Trump’s favorite actor — Alec Baldwin (eh, maybe I’m wrong about that) — takes the spotlight in the celebrity roast “One Night

Only: Alec Baldwin” (9 p.m. Sunday on Spike TV). Among the guests: Julianne Moore, Tracy Morgan, Jane Krakowski and former President Bill Clinton. Of course, count on Baldwin’s impersonation of the president — President George Washington.

Ahead of FX’s new season of “American Crime Story” next year with Ricky Martin and Darren Criss, “20/20” reopens the 20-year-old case

that shocked the nation in “Dying to Be Famous: The

Versace Murders” (tonight at 10 on ABC). The hour follows the bloody path of serial killer Andrew Cunanan, climaxed with the slaying of legendary fashion designer Gianni Versace. The hour also includes interviews with Cunanan’s roommate and his siblings.

Billy Bob Thornton, Riz Ahmed, Ewan McGregor, Sterling K. Brown, John Lithgow and Jeffrey Wright hold court on the business of acting on “Close Up With the Hollywood Reporter” (Sunday at 10 a.m. on Sundance TV). You’ll be hearing at least a few of those actors’ names again when the Emmy nominations are announced next week.

“The Defiant Ones” (miniseries premiere Sunday at 9 p.m. on HBO) tells the story of the collaboration between Jimmy Iovine and Dr. Dre with interviews with both as well as Bruce Springsteen, Bono and Stevie Nicks.

Megyn Kelly interviews singer Ed Sheeran about his music, his recent Twitter comments and, the most important thing, his upcoming cameo on “Game of Thrones” on “Sunday Night with Megyn Kelly” (Sunday at 7 p.m. on NBC).