"Fourth Annual Message
December 6, 1864
...
For myself, I have no doubt of the power and duty of the Executive, under the law of nations, to exclude enemies of the human race from an asylum in the United States. If Congress should think that proceedings in such cases lack the authority of law, or ought to be further regulated by it, I recommend that provision be made for effectually preventing foreign slave traders from acquiring domicile and facilities for their criminal occupation in our country."
"Proclamation 101 - Enrollment of Aliens for Military Duty
May 8, 1863
Whereas it is claimed by and in behalf of persons of foreign birth within the ages specified in said act who have heretofore declared on oath their intentions to become citizens under and in pursuance of the laws of the United States, and who have not exercised the right of suffrage or any other political franchise under the laws of the United States or of any of the States thereof, that they are not absolutely concluded by their aforesaid declaration of intention from renouncing their purpose to become citizens, and that, on the contrary, such persons, under treaties or the law of nations, retain a right to renounce that purpose and to forego the privileges of citizenship and residence within the United States under the obligations imposed by the aforesaid act of Congress:"