What controversial issue is uniting right-wing Ron Johnson and left-wing Tammy Baldwin?

Ending the protection of wolves.

The bill comes after a federal judge in California last month ordered protections be restored for wolves across most of the U.S. after the Trump administration removed them from the endangered species list. Re-listing wolves on the list effectively banned any wolf hunting or trapping seasons and prohibited farmers and ranchers from killing wolves preying on livestock.

ADDED: "We have doomed the wolf not for what it is but for what we deliberately and mistakenly perceive it to be: the mythologized epitome of a savage, ruthless killer—which is, in reality, not more than the reflected image of ourselves. We have made it the scapewolf for our own sins."