To the Senate of the United States:
I herewith transmit to the Senate, with a view to its ratification, a convention between the United States and the Mexican Republic for the extradition of fugitives from justice. This convention was negotiated under the directions of my predecessor, and was signed this day by John M. Clayton, Secretary of State, on the part of the United States, and by Senor Don Luis de la Rosa, envoy extraordinary and minister plenipotentiary of Mexico, on the part of that Republic. The length of the boundary line between the two countries, extending, as it does, from the Pacific to the Gulf, renders such a convention indispensable to the maintenance of good order and the amicable relations now so happily subsisting between the sister Republics.
Millard Fillmore, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/200812