Nullify Abortion

is a pro-life, grassroots organization that educates, mobilizes, and empowers pro-life advocates. We accomplish this by educating the public about the right of the states—recognized by the Tenth Amendment—to resist unconstitutional, federal abortion mandates.

 Where powers are assumed which have not been delegated, a nullification of the act is the rightful remedy: that every State has a natural right in cases not within the compact, (casus non foederis,) to nullify of their own authority all assumptions of power by others within their limits: that without this right, they would be under the dominion, absolute and unlimited, of whosoever might exercise this right of judgment for them

Thomas Jefferson
Resolutions Relative to the Alien and Sedition Acts

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Thus the right of nullification meant by Mr. Jefferson is the natural right, which all admit to be a remedy against insupportable oppression...

James Madison
On Nullification, December 1834