Your new book, "Crisis and Command," is an eloquent, fact-laden history of audacious power grabs by American presidents going back to George Washington. Which president would you say most violated laws enacted by Congress?

I would say Lincoln. He sent the Army into offensive operations to try to stop the South from seceding. He didn't call Congress into special session until July 4, 1861, well after this had all happened. He basically acted on his own for three months...

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