The House Democratic impeachment prosecutors have one more day to convince the Republican-controlled Senate that President Trump should be removed from office for abuse of power and obstruction of Congress — or at least that four Republicans should join the 47 Democrats to subpoena evidence and witnesses Trump blocked from House investigators. The three most plausible GOP defectors are Sens. Susan Collins (Maine), Mitt Romney (Utah), and Lisa Murkowski (Alaska), but both parties are closely watching Sen. Lamar Alexander (R-Tenn.), Politico reports.

Trump, who opposes witnesses, has both carrots and sticks to offer wavering Republicans. One Trump confidante told CBS News that GOP senators have been warned: "Vote against the president, and your head will be on a pike."

In opening statements, House managers examined the debunked conspiracy theories invoked by Pres. Trump. A @POTUS confidant tells CBS News that GOP senators were warned: “vote against the president & your head will be on a pike.” Here's @nancycordes https://t.co/LV1Y6QveIh pic.twitter.com/tLB9EpoWr8 — CBS Evening News (@CBSEveningNews) January 23, 2020

Senate Majority Leader Mitch McConnell (R-Ky.) has been warning his colleagues that subpoenaing former National Security Adviser John Bolton and other witnesses "could indefinitely delay the Senate trial" with "a protracted and complex legal fight over presidential privilege," an argument amplified Wednesday in a Senate GOP briefing by former Attorney General Michael Mukasey. That legal quagmire rationalization appears to resonate with Murkowski and other Republicans — though it's unlikely a subpoena signed by the chief justice of the Supreme Court after being approved by a majority of the Senate could be contested in court.

Trump has also been "rewarding senators who have his back on impeachment" by helping them raise campaign cash, "and sending a message to those who don't to get on board," Politico reported in October. And Trump, U.S. Chamber of Commerce strategist Scott Reed noted, "has the ability to turn on the money spigot like no one else."

Impeachment isn't like any other trial — which is good for Trump. Because in a normal trial, appearing to bribe or threaten jurors is frowned upon. Peter Weber