House impeachment investigators on Wednesday summoned John R. Bolton, President Trump’s former national security adviser, and two top White House lawyers to testify next week in their inquiry into Mr. Trump’s pressure campaign on Ukraine, closing in on critical witnesses as they prepare to go public with their investigation.
Mr. Bolton, a fiery foreign policy veteran, could be a marquee player in the House’s month-old impeachment inquiry. His deputies have testified that Mr. Bolton, who left the White House in September amid disagreements with the president, was angry about the efforts to pressure Ukraine to open investigations into Democrats. Rudolph W. Giuliani, the president’s personal lawyer who was leading the charge, he warned, was a “hand grenade who’s going to blow everybody up.”
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