Massachusetts is joining 14 other states in a motion to intervene in a lawsuit filed by House Republicans.
Critics say it undercuts the affordability of health insurance plans under the Affordable Care Act.
Attorney General Maura Healey says the intervention is necessary to protect critical federal payments that support health care in the states.
She says despite attempts by the Trump administration and the Republican Congress, the ACA remains the law of the land.
(JEFF PACHOUD/AFP/Getty Images)