“Saturday Night Live” once again dipped into its deep reserve of celebrity guest stars to portray the various members and associates of President Trump’s administration, this time turning to Steve Martin, who played Roger J. Stone Jr., the longtime Trump adviser who was arrested on Friday after having been indicted by the special counsel, Robert S. Mueller III.

The opening sketch of this week’s episode, hosted by James McAvoy and featuring the musical guest Meek Mill, was a parody of the Fox News program “Tucker Carlson Tonight.” Carlson was played by the “S.N.L.” cast member Alex Moffat, who explained, “I’m like if those shorts with the little whales on them came to life.”

Moffat introduced his top story: “President Trump’s heroic end to the shutdown,” he said. “It did take him 35 days, but he was finally able to get no wall.” Interviewing another Fox News personality, Jeanine Pirro (Cecily Strong), Moffat said, “I’m going to smugly ask a question that I already know the answer to, and a warning to our viewers, my voice will get very high.”