President Trump's former national security adviser John Bolton knows about "many relevant meetings and conversations" connected to the House impeachment inquiry, his lawyer Charles Cooper wrote in a letter to the House general counsel. House investigators want to interview Bolton about Trump's interactions with Ukraine, but they have refrained from issuing a subpoena to avoid getting drawn into lengthy court proceedings. In the letter, Cooper said Bolton would be willing to cooperate, but only if a court rules he can ignore the White House's objections. Acting White House Chief of Staff Mick Mulvaney, who skipped his scheduled deposition Friday, also filed to join a lawsuit started by Bolton's former deputy Charles Kupperman asking for a judicial ruling on whether they are obligated to comply with the congressional requests.

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