On the subdued role of Chief Justice John Roberts during the Senate impeachment trial: “He was at best the Senate’s crossing guard — or perhaps the traffic cop when he admonished the parties to stay civil.”
"The United States political scene is as deeply polarized along partisan lines as it has been for at least a century. It would take a very brave Republican indeed to break ranks with the president under these circumstances."
"In the House, [impeachment] was largely a partisan process. It's looking like it's now going to be largely a partisan process in the Senate as well"
Unmaking the presidency
What’s next in the impeachment process?
Impeachment, foreign interference, and election security in 2020
On the question of bringing witnesses and new evidence into the Senate trial on impeachment: "Democrats will ask, ‘Don’t the American people deserve to know the truth?’ On the other hand, [Republicans] may well calculate that public testimony would create uncertainties that they’re willing to go to considerable lengths to avoid.”