Basic structure doctrine is a doctrine of legal and
political theory according to which there are limits on the power of the
legislative branch to amend the constitution. According to this doctrine, while
the legislature may amend, alter, or revise most provisions of the
Constitution, it cannot change the Constitution’s basic structure or core
features. According to the doctrine, courts can prevent such changes to the
constitution by the legislature by declaring them to be
unconstitutional and void.