MANCHESTER, N.H. —

On the eve of arguments in front of a federal appeals court, New Hampshire's Democratic congressional delegation warned that a lawsuit aimed at overturning the Affordable Care Act could have devastating effects for thousands of Granite Staters.

President Donald Trump has said the health care law isn't working and believes the lawsuit will be successful in court.

"President Trump and Republican leadership have still not provided any replacement plan for the Affordable Care Act, so there is no Plan B," said U.S. Sen. Jeanne Shaheen.

Lawmakers warned that if the ACA is eliminated, thousands of Granite Staters would lose their ability to get access to affordable health care.

"If the Trump administration gets its way in this partisan lawsuit, it would raise health care costs, rip away critical protections for patients with preexisting conditions and leave millions of Americans uninsured," said U.S. Sen. Maggie Hassan.

"There are 130 million Americans with preexisting conditions, including half the adult population here in New Hampshire, that would be discriminated against by insurance companies if this lawsuit succeeds," said U.S. Rep. Chris Pappas.

Overturning the ACA would also unravel Medicaid expansion, which the delegation said is essential to addiction recovery.

"We know right here in New Hampshire that our only chance against this epidemic is expanding access to affordable treatment," said. U.S. Rep. Annie Kuster.

Darrell Lennon said he was over-prescribed pain medication after an injury but is now in recovery. He said access to health care allowed him to fight back from addiction.

"It gave me a voice, and I hope that someone hears this story, it touches someone's heart and not take the humanness out of people," he said.