President Donald Trump said on Tuesday he likely will sign an order this week that is expected to allow Americans to buy stripped-down health insurance policies, a step some experts say would further undermine the Obamacare law that Trump opposes.

Unable to win passage of legislation to dismantle the 2010 law in a Congress led by his own party, Trump indicated he would take unilateral action. He offered few specifics beyond saying his action would let people cross state lines to obtain "great, competitive healthcare" costing the United States "nothing."

The expected order would allow small businesses and individuals to band together as associations to buy health insurance plans that would be exempt from some Obamacare requirements. These include mandatory coverage for 10 essential health benefits such as maternity and newborn care, prescription drugs and mental health treatment.