Fifth Annual Message
12/02/1821
https://www.presidency.ucsb.edu...
Now, therefore, be it known that I, James Monroe, President of the United States, in pursuance of the authority aforesai...
Sensible of what I owed to my country, I felt strongly the obligation of observing the utmost impartiality in selecting ...
This power can be granted only by an amendment to the Constitution and in the mode prescribed by it.
I am of opinion that Congress do not possess this power; that the States individually cannot grant it.