(CNN) Brace yourselves -- it looks like Obamacare premiums could jump by double digits again next year.

Insurers in several states have requested large rate hikes for 2019, with many pointing to steps taken by President Donald Trump and Republicans in Congress as the main reasons why.

New York insurers want to hike rates by 24%, on average, while carriers in Washington are looking for a 19% average premium increase. In Maryland, CareFirst is asking for an average 18.5% rate bump for its HMO plans and a 91% spike for its PPO policies (which have far fewer enrollees), while Kaiser Permanente wants to boost premiums by more than 37%, on average.

Many insurers cite two key drivers of the increases: Congress' elimination of the penalty for the individual mandate -- which requires nearly all Americans to have coverage or pay up -- and the Trump administration's expected expansion of two types of health plans that don't have to adhere to Obamacare's regulations.

"Health insurance providers are now making decisions about market participation and pricing for the 2019 plan year in a market that continues to face uncertainty and instability challenges," America's Health Insurance Plans, an industry group, wrote in a recent report.