Nearly six years after defending the Affordable Care Act at the Supreme Court, former U.S. Solicitor General Don Verrilli is diving back into the fight to defend the Obama-era law.

Verrilli is among a team of lawyers representing the newly Democratic-controlled House of Representatives, which sought late Thursday to step in as a defendant in a lawsuit threatening to dismantle the ACA. Texas Attorney General Ken Paxton and several other states are leading that challenge.

The House, backed by Verrilli and their newly-hired counsel Douglas Letter, filed a motion to intervene in the lawsuit in Texas. It is one of the first major acts for Democratic lawmakers who stepped into the House majority earlier Thursday and repeatedly vowed to step in to defend the health care law.