Trump team opts to not burn down the house

• "They have the burden of proof, and they have not come close to meeting it," White House counsel Pat Cipollone said.

In the chamber: 

• Sen. Collins, Murkowski and Gardner were the most diligent notetakers of the Senate Republicans who are being eyed as possible votes to call witnesses.
• Sen. Mitt Romney, sitting at the back of the chamber, and Sen. Lamar Alexander mostly sat back and listened.
• Republicans mostly paid close attention to most of the presentations, though a few began looking away or reading as White House deputy counsel Patrick Philbin spoke. Democrats looked more bored.
• Senate Democratic Leader Chuck Schumer listened closely, scowling.

2020 watch:

• Sen. Bernie Sanders sat slumped back in his seat, fidgeting or resting with his chin in his hand (though he leaned forward with a puzzled look when Philbin criticized Schiff).
• Sen. Elizabeth Warren spent a long time hunched over a legal pad, writing and not appearing to pay close attention — though she sat up and listened to Cipollone's closing remarks.

• Sen. Amy Klobuchar took some notes and listened to some of the arguments, but often looked away and stared around the room.

What to watch: Whether the Trump team stays focused on the legal issues or veers into attacks on the Bidens when they resume arguments Monday at 1 p.m.

• Either way, Cipollone said the team doesn't plan to take the full 24 hours — because they don't think they need it.

Go deeper: Impeachment trial draws shrugs — by design