President Joe Biden on Friday announced a final rule that will open up Obamacare plans to tens of thousands of immigrants who came to the United States as children but do not qualify for government health insurance because they lack legal status. Federal health officials estimate that roughly 100,000 people enrolled in the Deferred Action for Childhood Arrivals program will sign up for subsidized plans through the health insurance marketplace over the next year under the rule, which the Biden administration proposed last year. The announcement comes as Biden continues to make health care and his defense of the Affordable Care Act a centerpiece of his reelection campaign.