Inside Michigan's critical swing county

ABC News Live goes on a journey along Route 53 in one of the most critical swing areas in the entire country: Macomb County, Michigan.

The thousands of voters there helped deliver a win for President Donald Trump in the 2016 presidential election. How are these voters feeling nearly three years later? Has the president lived up to his promises? Hear from a mayor who voted for President Trump in 2016, but does not plan to do so again in 2020. He’ll give us the pulse of the independent voters in his city who he says have "motor oil flowing from their veins."

This all comes just one day before a massive GM assembly plant in Macomb County closes for good.

Watch the full segment on a special edition of ABC News Live's "The Briefing Room" live from the 2nd Democratic Debate in Detroit.