Andrew Johnson actually said...

An unnaturalized person can not take this oath, but an alien who has been naturalized can take it.

The oath prescribed in the supplemental act defines all the qualifications required, and every person who can take that oath is entitled to ...

A person forced into the rebel service by conscription or under a paramount authority which he could not safely disobey, and who would not h...

The board of registration have no authority to administer any other oath to the person applying for registration than this prescribed oath.