FILE - This Thursday, July 2, 2015, file photo shows the building housing Centene Corporation headquarters in Clayton, Mo. Health insurer Centene says enrollment from the Affordable Care Act's troubled insurance exchanges has swelled, and it's ready to return in 2018, even as competitors waver and President Donald Trump warns of the law's demise. The Medicaid coverage specialist said Tuesday, April 25, 2017, that it covered nearly 1.2 million people through the exchanges at the end of the first quarter, up 74 percent from 683,000 in the previous year's quarter, and it wouldn't rule out more growth. (AP Photo/Jeff Roberson, File)
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