Health insurers are asking for sharp increases in the cost of their Obamacare plans next year, thanks to instability in the law's coverage markets that's been compounded by the Trump administration.

In Maryland, Virginia and Connecticut -- the first states to make filings public -- premiums for Affordable Care Act plans will rise more than 20 percent on average, according to data compiled by 

ACASignups.net and Bloomberg. The increases follow years of rising premiums under ex-President Barack Obama.

The increases can be blamed in part on uncertainty among insurers about the strength of the law's requirement that people carry insurance. The Trump administration has raised doubts about whether it will enforce what is considered by some insurers to be an already insufficient penalty.