Final answer:
The idea that states could declare a law null and void was primarily associated with the Democrat-Republican Party. It was asserted in the Virginia and Kentucky Resolutions, which argued that states had the right to nullify federal laws they deemed unconstitutional.
Step-by-step explanation:
The idea that states could declare a law null and void was primarily associated with the Democrat-Republican Party. The concept was asserted in the Virginia and Kentucky Resolutions, which were written by James Madison and Thomas Jefferson in response to the Alien and Sedition Acts enacted by the Federalist-controlled government. These resolutions argued that states had the right to nullify federal laws they deemed unconstitutional.