Idaho's insurance regulator blasted the Trump administration's unwillingness to pay Obamacare insurers as the reason premiums couldrise by up to 38 percent next year.

The state's Department of Insurance posted proposed rates for 2018 Monday. The state's six Obamacare insurers are calling for an average 38 percent rate hike, including a 50 percent increase for the silver plan, which is the most popular of Obamcare's three plan options.

Idaho said the proposed increase for silver plans was because of "the potential refusal by the federal government to fund the cost share reduction mechanism."

Insurers are required under law to lower co-pays and deductibles for lower-income Obamacare customers, with the government reimbursing them. But the Trump administration has not decided if it will make the payments in 2018.

President Trump has repeatedly said he wants to let Obamacare implode as a way to get Democrats on board for repealing the law.

Idaho's insurance director, Dean Cameron, said the uncertainty is leading to price increases.

"I call on Congress to either repeal the CSR requirement or fund the program," he said. "That action alone would reduce the proposed increase by at least 20 percent on the silver plans."

Several other states have pointed to the lack of commitment to CSR payments as reasons for increasing premiums. Other reasons include lingering problems with Obamacare's enrollment, namely that not enough young and healthy people have signed up to offset the costs of sicker patients.