Donald Trump’s fourth scheduled stop in eight days in Wisconsin is a sign of his increased attention as Republicans fret about the former president’s ability to match the Democrats’ enthusiasm and turnout machine.

Democratic presidential candidate Kamala Harris is opening a two-day stay in Wisconsin and Michigan, and Republican candidate Donald Trump will be in Michigan on Thursday as the two candidates grapple for wins in the “blue wall” battleground states,

Harris has won the support of more than 200 Bush, McCain and Romney alumni and more than 100 Republican former national security officials.