Gentlemen of the Senate:
Considering the circumstances which prevented the late commissioners from concluding a peace with the Creek Nation of Indians, it appeared to me most prudent that all subsequent measures for disposing them to a treaty should in the first instance be informal.
I informed you on the 4th instant that the adjustment of the terms of a treaty with their chiefs, now here, was far advanced. Such further progress has since been made that I think measures may at present be taken for conducting and concluding that business in form. It there fore becomes necessary that a proper person be appointed and authorized to treat with these chiefs and to conclude a treaty with them. For this purpose I nominate to you Henry Knox.
George Washington, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/200641