Whistleblower’s claim is ‘most serious’ against a president in US history: Analysts

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NBC’s Peter Alexander and NBC national security analyst Jeremy Bash weigh in on the latest with the whistleblower complaint at the center of President Trump’s Ukraine controversy. Bash says: “This is the most serious allegation against an American president in country’s history: That the president used his office to press a foreign country to interfere in an American election.”