As the impeachment trial of President Trump draws to a close, has this been a useful exercise? What did we learn? Who were the friends we made along the way? And will the result of the trial matter for future presidencies, or for the November election?

Susan Hennessey of the Lawfare blog will tell us what may (or may not) be stopping John Bolton from talking, with the Senate declining to seek his testimony. Paul Krugman will join us to talk about his new book Arguing With Zombies where the zombies are ideas like “tax cuts pay for themselves” and “budget deficits are hurting the economy.” And Juliette Kayyem gives her analysis of the US response so far to the Wuhan coronavirus.

All that plus a look ahead to the Iowa caucuses — hello, that’s on Monday — is in this episode.