The main health insurer trade group is warning Senate Republicans against including a controversial conservative amendment in their healthcare bill, saying the move would destabilize the market and harm coverage for people with pre-existing conditions.

America's Health Insurance Plans (AHIP) warns in a position paper obtained by The Hill that the proposal from Sens. Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE (R-Texas) and Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) would cause people with pre-existing conditions to “potentially lose access to comprehensive coverage and/or have plans that were far more expensive, as premiums in the Exchange market would rise much faster than under existing market conditions.”

The lawmakers' proposal would allow insurers to sell plans that do not meet ObamaCare regulations if they also sold one plan that does. Conservatives argue this idea would allow younger and healthier people to buy cheaper plans.

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But the insurers, and many health experts, warn that sick people would be the only ones left in the more expensive, comprehensive ObamaCare plans, spiking those premiums.

“The Exchange markets would basically function like a high-risk pool — with unaffordable premiums for those with pre-existing conditions,” AHIP said. “As premiums rose, only those with the highest health needs and expenses would remain thereby accelerating the decline in the Exchange market.”

AHIP warns the proposal would lead to a “downward spiral” in the market, with higher premiums and lower enrollment.

GOP leaders are currently deciding whether to include the amendment in the bill, which is key for winning conservative support but could alienate more moderate members.

Separately on Wednesday, a coalition of patient groups, including the American Cancer Society and American Heart Association, also warned against the amendment.

Those groups said the change “could create serious access and affordability

problems for any person with a pre-existing health condition, chronic disease or disability.”