Franklin Roosevelt actually said...

"I fully share your confidence that the unity of purpose which binds our peoples and countries together in the prosecution of the war will be translated into a close and lasting collaboration."

"I welcome you in that capacity."

"Our two countries are united against a common enemy."

"I can assure you, that in the performance of this high task with which your Government has entrusted you, Your Excellency may count upon receiving the full cooperation and support of the Government of..."