Democrats have switched from defense to offense, going on the attack as insurers announce major increases in their premiums for Obamacare next year.

The party is blaming proposed hikes of up to 50 percent for some 2018 Obamacare plans on the Trump administration’s efforts to create uncertainty in the individual market, which includes Obamacare’s exchanges. However, some insurance plans have noted other factors in the proposed increases, including Obamacare’s insurer tax.