More than 25 Wisconsin startup, tech and business leaders published an open letter calling for U.S. Sen. Ron Johnson to retire at the end of his term, the group announced today.

The letter asserts that the recent actions of Sen. Johnson “are directly harming the Wisconsin people, its business community and the Wisconsin Idea.”

Madison-based leaders who signed the letter include Alex Kubicek, CEO of Understory; Abigail Barnes, CEO of Allergy Amulet; and Sam Rusk, president of EnsoData.

Click here to read the letter.