01/16/1863
https://www.presidency.ucsb.edu...
"But they can not be required to take an oath of allegiance to this Government, because it conflicts with the duty they owe to their own sovereigns."
"There is much in the bill to which I perceive no objection."
"I think the greater punishment can not be constitutionally inflicted in a different form for the same offense."
"For the reasons stated, I return the bill to the House, in which it originated."