To the Senate of the United States:
I submit to the Senate, for its consideration with a view to ratification, a treaty of extradition concluded by Mr. Corwin with the Mexican Government on the 11th of December last.
I also submit a postal convention concluded by that gentleman at the same time, and a copy of his dispatch of the 24th of the same month explanatory of the provisions of both these instruments, and the reasons for the nonratification by Mexico of the postal convention concluded in this city on the 31st of July last and approved by the Senate on the 6th of August.
A copy of a letter from the Postmaster-General to the Secretary of State in relation to Mr. Corwin's postal convention is also herewith communicated. The advice of the Senate as to the expediency of accepting that convention as a substitute for the one of the 31st of July last is requested.
Abraham Lincoln, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/203109