Banks explains the Insurrection Act in HowStuffWorks article

Banks, William"The Insurrection Act may be invoked only following an invasion, insurrection or widespread domestic violence," says Professor Emeritus William C. Banks. "Only if states attempt to leave the Union would state defiance enable Insurrection Act authority. Otherwise the states control their citizens' health, welfare and safety." Banks was interviewed for the HowStuffWorks article "What Is Martial Law, and Could the U.S. Declare It Due to COVID-19?" 04/01/20