What’s at stake for Medicaid—the lifeline for millions of low-income Americans—under President Donald Trump and a Republican-controlled Congress determined to slash spending? How would cutting Medicaid affect the more than 72 million people who rely on it for health care? And is Social Security next on the chopping block?

To break it down, we spoke with Alex Lawson, executive director of Social Security Works, an organization fighting to protect and expand Social Security, Medicare, and Medicaid; lower drug prices; and ensure health care as a human right. This is part one of a two-part series.