Weld District Attorney Ken Buck on Thursday called on U.S. Sen. Michael Bennet, D-Colo. to join a growing bipartisan group in Congress and sign on as a co-sponsor of the Federal Reserve Sunshine Act.

In an e-mail to Bennet, Buck, a Republican candidate for the Senate seat Bennet currently holds, wrote that "auditing Federal Reserve operations isn't a political question. It's a simple matter of good government and financial responsibility."