Sean Hannity says Trump had “a sworn duty, a constitutional duty” to ask Ukraine for a favor

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Citation From the October 1 edition of Fox News' Hannity

SEAN HANNITY (HOST): Let's be clear, the president of the United States has a sworn duty, a constitutional duty to investigate crimes. 

United States has a treaty with Ukraine, and several other countries like Australia, Italy, and Great Britain that requires cooperation in criminal investigations, and that's not all.