President Donald Trump’s former National Security Adviser John Bolton knows about “many relevant meetings and conversations” surrounding Trump’s communications with Ukraine, Bolton’s lawyer told lawmakers Friday.

Bolton has information that House impeachment investigators do not know about yet, his lawyer Charles Cooper said in a letter to the chief House lawyer, which was first reported by The New York Times. Lawmakers have called on Bolton to testify as part of the impeachment inquiry, but his lawyer first wants a court to rule on whether he should be made to do so, given that the White House has chosen not to cooperate with the inquiry. 

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