The acerbic clash between President Trump and Michigan Gov. Gretchen Whitmer over delivering services to states afflicted with the coronavirus carries great risk for both politicians, as voters look to Washington and state capitals for bipartisan leadership during the public health crisis.

Whitmer, 48, is a co-chair of likely Democratic nominee Joe Biden’s campaign and is widely believed to be a top candidate to become his running mate. Trump is seeking reelection this November, and Michigan was among the battleground states that put him in the White House four years ago. The two have frequently sparred over whether the federal government is providing needed supplies quickly enough.