Who is George Kent and why is he a key player?

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As Deputy Assistant Secretary of State for European and Eurasian Affairs George Kent testifies under subpoena on Capitol Hill as part of the impeachment inquiry, Stephanie Ruhle breaks down who Kent is and why he is a key player in all of this. Weighing in: NBC’s Garrett Haake, MSNBC Legal Analyst Danny Cevallos, and Politico White House Reporter Nancy Cook.