Despite President Donald Trump’s efforts to take down “Obamacare,” more than 600,000 people signed up for coverage the first week of open enrollment, the government said Thursday. With only four days of data, experts say the Affordable Care Act doesn’t seem to be collapsing. If anything sign-ups for 2018 are on track with previous years. Enacted under former President Barack Obama, the health care law offers subsidized private insurance to people who don’t have coverage on the job. This year’s enrollment numbers are being closely watched because of the Trump administration’s disdain for the program.