Why is the Necessary and Proper Clause a source of ongoing debate?

The Necessary and Proper Clause, found in Article I, Section 8 of the U.S. Constitution, allows Congress to make laws deemed necessary and proper for executing its enumerated powers. This broad interpretation has led to ongoing debate over the extent of federal power versus states' rights, with some arguing that it enables federal overreach. Critics contend that it undermines the Constitution's original intent, while supporters assert it is essential for addressing contemporary issues. The clause's ambiguity continues to fuel differing interpretations in legal and political discourse.