Maura Healey (D-MA) on Thursday introduced legislation that would make it unlawful for another state’s National Guard to be deployed to Massachusetts. The proposal comes amid heightened national debate over the role of the National Guard in domestic operations. National Guard units typically operate under dual authority of state governors and, when federalized, the president. State governors command National Guard forces for domestic emergencies, but units can be federalized for national missions. Healey framed her National Guard and ICE proposal as a part of a broader push to protect Massachusetts residents from federal immigration enforcement actions she views as heavy-handed.