The Trump impeachment trial has been gripped by drama surrounding witnesses, particularly former national security adviser John Bolton: Will he or won't he testify?

Former National Security Adviser John Bolton has even more bombshells to offer in his upcoming book.Not long before President Trump's Senate impeachment trial was set to resume Friday, The New York Times reported that in Bolton's book, he alleges Trump in May 2019 directed him to help with a Ukraine pressure campaign. This would have been two months before Trump's infamous phone call with Ukrainian President Volodymyr Zelensky, during which he pushed for investigations into former Vice President Joe Biden and his son. Bolton reportedly writes that during an Oval Office meeting also attended by Acting White House Chief of Staff Mick Mulvaney, Trump's personal lawyer Rudy Giuliani, and White House counsel Pat Cipollone, Trump told him "to call Volodymyr Zelensky, who had recently won election as president of Ukraine, to ensure Mr. Zelensky would meet with Mr. Giuliani, who was planning a trip to Ukraine to discuss the investigations that the president sought." Bolton writes he did not end up making the call. The Times notes this would be the "earliest known instance" of Trump taking steps as part of a pressure campaign against Ukraine that would ultimately result in his impeachment. This follows a previous Times report that Bolton in his book writes that Trump said he wanted to continue holding up aid to Ukraine until it investigated the Bidens. Giuliani on Friday denied that Cipollone and Mulvaney were ever involved in conversations having to do with Ukraine, telling the Times Bolton's account is "absolutely, categorically untrue." Trump is also denying the report, saying in a statement, "I never instructed John Bolton to set up a meeting for Rudy Giuliani, one of the greatest corruption fighters in America and by far the greatest mayor in the history of N.Y.C., to meet with President Zelensky. That meeting never happened." More stories from theweek.com Mitch McConnell's rare blunder John Bolton just vindicated Nancy Pelosi All the president's turncoats

Academics, politicians, and members of the media panned Sen. Elizabeth Warren for a "stunt" move, which put Supreme Court Chief Justice John Roberts in the awkward position of questioning his own legitimacy. 

The Massachusetts Democrat used the Senate impeachment trial against President Trump to suggest Chief Justice Roberts was somehow ...

Some Senate Republicans and Trump administration officials are signaling the impeachment trial could spill over into next week.The timeline is largely dependent on two things: how long senators want to deliberate and the level of cooperation between...

Senators have voted not to hear witnesses in the impeachment trial of Donald Trump, meaning his acquittal on charges of abuse of power and obstructing Congress is now almost certain.A motion that would allow members of the upper chamber to subpoena witness testimony and additional documents was defeated 51 votes to 49.

The impeachment trial of President Trump faces a climactic vote on Friday, when senators will decide whether to call witnesses and prolong impeachment proceedings or bring them to a swift conclusion.

Former Republican Ohio Governor John Kasich reacts to Sen. Lamar Alexander (R-TN) saying that he will oppose calling witnesses for the impeachment trial against President Donald Trump.

The Senate will hear up to four hours of debate from President Trump’s lawyers and from the Democratic House impeachment managers, starting just after 1 p.m., on whether to call witnesses. A vote on whether to consider witnesses will follow, probably around 5 p.m.