Shiny new Jeep Wranglers and Cherokees, lined up in their thousands, wait to be shipped out by train from the Chrysler plant in Toledo, Ohio, where Donald Trump has come to court blue-collar voters with promises of jobs.

The industrial city on the shores of Lake Erie, which has lost a quarter of its population since the 1970s as jobs dried up, is a Democratic stronghold with a big union presence.

President Barack Obama saved the local auto industry from bankruptcy, and the Democratic White House nominee Hillary Clinton enjoys solid support among the city's black voters.