Ron Paul Defends Oath Keepers
Oath Keepers is a non-partisan association of currently serving military, reserves, National Guard, veterans, Peace Officers, and Fire Fighters who will fulfill the Oath we swore, with the support of like minded citizens who take an Oath to stand with us, to support and defend the Constitution against all enemies, foreign and domestic, so help us God... Our Oath is to the Constitution. ~ Video
Doctrine upholding the right of a U.S. state to declare null and void any federal law that they deem unconstitutional.
US Supreme Court: Interposition
Implied that the states have a right to interpose their authority to protect their citizens from the unconstitutional measures of the federal government.
Ron Paul Defends Oath Keepers March 8, 2010 Newport Music Hall near Ohio State University.