Twenty Tennessee-based tea party and conservative groups published an open letter Wednesday to Sen. Lamar Alexander (R-TN) urging him to retire, the Wall Street Journal reported.
"During your tenure in the Senate we have no doubt that you voted in a way which you felt was appropriate. Unfortunately, our great nation can no longer afford compromise and bipartisanship, two traits for which you have become famous," the letter read, according to the Journal.
"America faces serious challenges and needs policymakers who will defend conservative values, not work with those who are actively undermining those values," the letter continued. "Quite honestly, your voting record shows that you do not represent the conservative values that we hold dear and the votes you have cast as Senator are intolerable to us."
The letter encouraged Alexander to retire rather than take on a primary challenger, according to the Journal, although no Republican has yet come forward to challenge Alexander's seat in 2014.