Democratic Debate Bares Divisions on Health Care, Unity Against Trump

In first of two debates among 20 presidential candidates, contenders vow major changes in policies on economy, health care, immigration.

Ten Democratic presidential candidates squared off in their first joint appearance Wednesday, laying bare an intraparty dispute over the nation’s health-care system while offering a united front in denouncing President Trump’s policies.

The two-hour session, the first of two consecutive nights of debates in Miami, offered the 10 their best opportunity to date to seize the spotlight in a crowded field vying to take on the president.

While the candidates...