Preventive Imprisonment....illiberal????

In this speech from Obama, he speaks about the need to have FEMA (Federal Emergency Management Agency) a sub agency of the Department of Homeland Security regulating which people 'might' be deemed to have criminal intent and therefore incarcerated in the interest of protecting Americans. Rachel Maddow carefully deconstructs this speech and her analysis is pretty damning as to the abuse of civil liberties, which of course the States swears by. Is this an example of illiberalism at it's 'finest' or is the President justified in his actions? The video can be found here.