Why Is An Elon Musk-backed Pac Running An Ad Against Republican State Legislators?

A group backed by Elon Musk is running ads targeting conservative Republican legislators in several states over their support of a federal drug pricing program. No one seems as surprised about the effort as the lawmakers themselves.

The video ad by Building America's Future is titled "Trump Underminers." It focuses on the federal 340B program, saying it "is now a disaster" and to "let Trump fix 340B."

The ad groups together five lawmakers in Kentucky, Nebraska, North Dakota, South Dakota and Tennessee whom it accuses of trying to mandate expansion of the program. It is one of the first signs since Trump returned to the White House of a group linked to Musk going after Republicans in individual states.

The legislators say they want to help rural hospitals and don't understand what is behind the criticism or why the group, of which Musk is a major donor, is singling them out.

Here's a look at the ad's claims and the mystery behind them: