To the Senate of the United States:
In the communication made to the Senate on the 13th of June, in answer to its resolution of the 2d of March last, there appears to have been, among other papers, sundry letters addressed to the Department of State by certain claimants or their agents containing reflections upon the character of the umpire appointed by His Prussian Majesty pursuant to the convention between the United States and the Mexican Republic of the 11th of April, 1839. As the call was for all communications which had been addressed to the Department of State by any of the claimants under that convention relative to the proceedings and progress of the mixed commission, the copies were prepared and submitted without attracting the attention either of the head of the Department or myself. If those letters had been noticed, their transmission to the Senate, if transmitted at all, would have been accompanied by a disclaimer on the part of the Executive of any intention to approve such charges. The Executive has no complaint to make against the conduct or decisions of the highly respectable person appointed by his sovereign umpire between the American and Mexican commissioners.
John Tyler, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/200431