President Trump's planned executive order on ObamaCare is worrying supporters of the law and insurers, who fear it could undermine the stability of ObamaCare. Trump’s order, expected as soon as this week, would allow small businesses or other groups of people to band together to buy health insurance. Some fear that these Association Health Plans (AHPs) would not be subject to the same rules as ObamaCare plans, including those that protect people with pre-existing conditions.