Kupperman and his previous boss, former national security adviser John Bolton, were close to Trump and counseled the president on Ukraine matters. Kupperman was also listening in on the July 25 call between Trump and the president of Ukraine that triggered a whistleblower complaint. Cooper also represents Bolton, who refused to testify after the White House claimed he and Kupperman were among a small cadre of close advisers to the president who have absolute immunity from congressional subpoenas.
Charles Kupperman, ex-deputy national security adviser, was subpoenaed by House Democrats but has asked a judge to rule on the matter
John Bolton relies on an outside group of advisers with ties to think tanks and organizations that will only reinforce the administration’s desire to wage war.
One of Mr. Bolton’s longtime associates, Charles M. Kupperman, a former Reagan administration official and defense contracting executive, has taken a temporary leadership post on the National Security Council, while at least three others — Frederick H. Fleitz, Sarah Tinsley and David Wurmser — are believed to be under consideration for posts.
Mr. Bolton’s relationships with most of the associates date back decades, to his days working in positions related to foreign policy in the Reagan administration.