Ms.

To protest the sandwich chain’s use of azodicarbonamide in its bread, Ms. Hari posted a video of herself chewing another item in which the chemical is found: a yoga mat.

The comment from Senator Mitch McConnell of Kentucky, delivered in his home state, was a harsh reminder for Ms. Capito of the tricky politics she was navigating as the Republican responsible for figuring out if there is a bipartisan compromise to be had with Mr. Biden on a major infrastructure and public works plan.