Washington (CNN) Lawyers for former national security adviser John Bolton have had talks with the three House committees leading the impeachment inquiry about a possible deposition, according to a source familiar.

If he does give a deposition, Bolton would join a handful of current and former Trump administration members who have been interviewed this month as part of the Democratic-led inquiry into President Donald Trump's dealings with Ukraine.

As House members who serve on the Intelligence, Oversight and Foreign Affairs committees have been interviewing witnesses in private, some of the committees' Democrats have said they believe there's a need for Bolton to testify.

Fiona Hill, Trump's former top Russia adviser, told lawmakers last week that she saw "wrongdoing" in American foreign policy and that Bolton had encouraged her to report her concerns to the National Security Council's attorney, sources had told CNN.

A source told CNN that Hill testified that Bolton referred to Trump's personal attorney Rudy Giuliani, who was working to dig up dirt on the Bidens, as a "hand grenade," who was "going to blow everybody up."

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