The document describes payments made for expedition supplies, and was signed by Hernán Cortés, who conquered the Aztecs.

FBI director Christopher Wray bemoaned the "uneven" support the US has gotten from Mexico to assist with law enforcement endeavors on a variety of fronts.

FBI Director Christopher Wray told lawmakers on Tuesday that the U.S. needs to see a whole lot more from Mexico in terms of stopping the cartels and the flow of migrants to the U.S.