06/28/1916
https://www.presidency.ucsb.edu...
"I do hereby admonish all citizens of the United States and every person to abstain from every violation of the provisions of the Joint Resolution and Act of Congress above set forth."
"I have found that there exist in Mexico such conditions of domestic violence promoted by the use of arms or munitions of war procured from the United States as contemplated by the said Joint Resolutio..."
"This is a matter of the gravest consequence."
"It is a matter of very grave concern."