• Republicans seem increasingly confident they can block witnesses
• John Roberts insists he will not say alleged whistleblower’s name
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12.55am GMT

The Senate is back in session, and House managers and Trump lawyers are back to fielding questions.

GOP Senators found a new way to raise the topic of the Bidens and Burisma: “Do you agree with John Kerry’s stepson that Hunter Biden working with Burisma was unacceptable?”

When then-Vice President Joe Biden’s son joined the board of an obscure Ukrainian gas company half a decade ago, it was a stunning coup for its owner, a former Ukrainian minister working to remake the company’s image as he faced a money-laundering investigation.

For Hunter Biden, the job came with risks: Ukraine was in the throes of political upheaval, and there was building scrutiny of former government officials profiting in the lucrative gas industry. His father was the face of the Obama administration’s effort to get Ukraine to crack down on corruption.

12.23am GMT

Before the break, House manager Adam Schiff even more directly reassured senators concerned about “endless delays”, once again suggesting a one-week period for deposition and “limited” time for witnesses. Chief Justice John Roberts could quickly resolve disputes, he said.

Lawmakers and journalists have been speculating all day about how the upcoming votes on witnesses could fall. Republican Senators Lamar Alexander and Lisa Murkowski were spotted together during the dinner break. Both are potential swing votes, and have told reporters they remain undecided.

Key swing vote Sen. Lamar Alexander told me he's going to announce his decision on witnesses TONIGHT, a decision that will make clear whether the Senate trial will come to a swift conclusion or if it will lead to a new phase over witnesses and documents.