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Follow PBS NewsHour’s complete coverage of U.S. news, reports and analysis.

Tuesday on the NewsHour, a look at what President Obama’s Keystone XL veto means for the pipeline’s prospects. Also: New findings on preventing peanut allergies, inside special courts designed for veterans dealing with PTSD, dramatic changes in American demographics and…

President Barack Obama's health secretary told Congress Tuesday that there is no administrative action that would fix the "massive damage to our health care system" that would result should the Supreme Court invalidate federal subsidies that help millions of Americans…