The former national security adviser's willingness to testify if subpoenaed could force the Senate majority leader to allow witnesses during the impeachment trial

Former national security adviser John Bolton's surprise announcement Monday that he is willing to testify in the Senate's impeachment trial significantly raises the already massive stakes of the pending votes in the chamber as to how the trial of President Donald Trump will be conducted. And it puts even more pressure on Senate Majority Leader Mitch McConnell as he seeks to keep his 52 GOP colleagues in line as both sides prepare for the historic proceeding.

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