The first few minutes of the Democratic debate on CNN between Hillary Clinton and Bernie Sanders were quite cordial.

Taking place in Flint, Mich., the town which has been thrust into the national spotlight amid its water crisis, the two candidates took questions from the audience about their plans to help the city recover and restore clean water to all its citizens.

But as the debate wore on, the two rivals had one of their testiest exchanges yet as discussion moved to trade policies, the auto bailout, Michigan’s struggling economy and gun control.

Michigan is an important political test

Source: Texas Public Radio