Under what laws can U.S. president discuss Prologed Dention?

Please watch Obama's famous 'tale of two speeches' in full.
http://www.youtube.com/watch?v=y75nDqGOgOE

"Indefinite Detention Without Trial" endorsed by Obama in an insult for humanity.

Is it constitutional for a U.S. President to discuss Prolonged Detention Policy?

If not, what disciplinary actions taken were against such acts?

If unconstitutional and no disciplinary actions taken, how lawful is the existence of U.S. Constitutions?