Answer:
a state could declare a federal law unconstitutional.
Step-by-step explanation:
A Constitution refers to a set of written laws and principles which is typically used to determine the power and authority of the government, as well as guarantee the fundamental rights of its citizens.
Basically, the Constitution accords powers to the national or federal government and these includes; enumerated or delegated, reflected, and concurrent powers.
John Caldwell Calhoun was an American congressman, secretary of war, politician, 7th vice president, and political theorist that hails from South Carolina. He was born on the 8th of March, 1782 in Abbeville, South Carolina, United States of America and died on the 31st of March, 1850 in Washington DC.
In order to favor minority rule over a majority rule, John supported concurrent majority through which the minority could oppose or block infringement on liberties and freedoms.
Hence, John Calhoun in his South Carolina Exposition and Protest argued that a state could declare a federal law unconstitutional based on state rights.