Jonathan Gruber, an MIT econ prof and a key parent of Romneycare and the Affordable Care Act, has written Trump says Obamacare is broken. He’s the one who broke it. Here's an excerpt:
What supporters of [Trumpcare] are not admitting, however, is that the ACA’s current failings are due to the misguided policies of Republicans and particularly the Trump administration. Before Donald Trump was elected, there were no places in the country where individuals could not buy insurance on the exchanges. The large premium increases announced last year were a one-time correction to make up for insurers’ dramatic underpricing in the first years of the ACA. The problems we are seeing now are due to the uncertainties injected into the market by the Trump administration’s actions to undermine the ACA’s success.