For further information relating to the return of Santa Anna to Mexico I refer you to my annual message of December 8, 1846. The facts and considerations stated in that message induced the order of the Secretary of the Navy to the commander of our squadron in the Gulf of Mexico a copy of which is herewith communicated. This order was issued simultaneously with the order to blockade the coasts of Mexico, both bearing date the 13th of May, 1846, the day on which the existence of the war with Mexico was recognized by Congress. It was issued solely upon the views of policy presented in that message, and without any understanding on the subject, direct or indirect, with Santa Anna or any other person. General Paredes evaded the vigilance of our combined forces by land and sea, and made his way back to Mexico from the exile into which he had been driven, landing at Vera Cruz after that city and the castle of San Juan de Ulloa were in our military occupation, as will appear from the accompanying reports and documents. The resolution calls for the "instructions and orders issued to Mr. Slidell at any time prior or subsequent to his departure for Mexico as minister plenipotentiary of the United States to that Republic." The customary and usual reservation contained in calls of either House of Congress upon the Executive for information relating to our intercourse with foreign nations has been omitted in the resolution before me. The call of the House is unconditional. It is that the information requested be communicated, and thereby be made public, whether in the opinion of the Executive (who is charged by the Constitution with the duty of conducting negotiations with foreign powers) such information, when disclosed, would be prejudicial to the public interest or not. It has been a subject of serious deliberation with me whether I could, consistently with my constitutional duty and my sense of the public interests involved and to be affected by it, violate an important principle, always heretofore held sacred by my predecessors, as I should do by a compliance with the request of the House. President Washington, in a message to the House of Representatives of the 30th of March, 1796, declined to comply with a request contained in a resolution of that body, to lay before them "a copy of the instructions to the minister of the United States who negotiated the treaty with the King of Great Britain, together with the correspondence and other documents relative to that treaty, excepting such of the said papers as any existing negotiation may render improper to be disclosed." In assigning his reasons for declining to comply with the call he declared that--