Franklin Roosevelt actually said...

"If personnel having the requisite qualifications are not available, or if the Secretary of State determines that the Government of the United States is unable for any reason to comply with the request..."

"all enemies who have entered upon the territory of the United States should be promptly tried in accordance with the Law of War"

"All requests of foreign governments for the loan of the services of officers and employees of the Government of the United States shall be communicated through the diplomatic channel to the Secretary ..."

"No reimbursement shall be accepted from any foreign government for any expenses not authorized in accordance with these regulations, and no funds advanced by a foreign government shall be used to pay ..."