From an AP story by Gary Fields headlined “Presidential centers from Hoover to Bush to Obama unite to warn of the fragile state of US democracy”:

Concern for U.S. democracy amid deep national polarization has prompted the entities supporting 13 presidential libraries dating back to Herbert Hoover to call for a recommitment to the country’s bedrock principles, including the rule of law and respecting a diversity of beliefs.

The statement released Thursday, the first time the libraries have joined to make such a public declaration, said Americans have a strong interest in supporting democratic movements and human rights around the world because “free societies elsewhere contribute to our own security and prosperity here at home.”