- He incarcerated war criminals who no longer believed they were Americans.
- He declared war while congress was out of session because the capital was under threat. But note that he didn't start a single battle until congress was back in session. And once they were back in session he had congress ratify the whole thing.
- Yes, Lincoln started an income tax, but because it wasn't a direct tax it didn't fall under article I of the constitution. And, it's worth noting, that in a later challenge to the law the supreme court agreed with him.