Writing in the Huffington Post , Leah Zallman -- a research scientist at the Institute for Community Health, a primary care doctor at Cambridge Health Alliance, and an instructor of medicine at the Harvard Medical School -- and Steffie Woolhandler -- an internist in the South Bronx, professor at the City University of New York School of Public Health at Hunter College, and lecturer in medicine at Harvard Medical School -- attempt to take Donald Trump to task for his claims about the health care costs from illegal immigrants: Throughout the primary season, leading Republican presidential candidates vied over who could bash immigrants the hardest. And they were promising more than border walls.