A group of supporters of failed GOP Senate candidate Roy Moore are calling for the censure of longtime Senator Richard Shelby, according to reports in Politico.

A group of Moore backers submitted a resolution to the Alabama Republican Party executive committee arguing for the public reprimand, saying Shelby's failure to back Moore - and his own statements that he cast a write-in vote - hurt the Republican-backed candidate.

The resolution comes after a pro-Moore group, Courageous Conservatives PAC, ran its own anti-Shelby robocalls last month.

"Sen. Richard Shelby stabbed President Trump and conservatives in the back," one of the calls said. "Tell Shelby you'll never forget his disloyalty to President Trump and the Republican Party for his treasonous actions. Tell Shelby he's betrayed his trust to Alabamians and he should resign his office. Call now."

The anti-Shelby robocall campaign was funded by Dallas investor Christopher Ekstrom. In an interview with Politico, Ekstrom likened Alabama's six-term Senator to Tennessee Sen. Bob Corker and Arizona Sen. Jeff Flake, both outspoken Trump critics.

"We no longer have Bob Corker to kick around, we no longer have Jeff Flake to kick around, but we do have Richard Shelby to kick around up and down the street until he gets out," Ekstrom said.

Shelby publicly said he would not support Moore after allegations the former Chief Justice had improper sexual contact with teenage girls in the 1970s. Shelby did not vote for Democrat Doug Jones, the eventual winner of the Dec. 12 election, but said he wrote in the name of a "distinguished Republican," despite a warning from the Alabama Republican Party that its members should support the nominee.

Shelby's statements about Moore were used in a robocall urging support for Doug Jones, something cited in the resolution to the state GOP.

Shelby's office provided Politico with a statement on the push by Moore backers.

"It is unfortunate to hear that instead of unifying the party ahead of its important 2018 election cycle, people within the Alabama GOP are making a shortsighted attempt to divide the party over Sen. Shelby's noble stance," spokeswoman Blair Taylor said.

Update Jan. 13, 2:46 p.m.: Story updated to clarify GOP resolution in Alabama does not call for resignation of Sen. Shelby and that the Senator did not endorse a write-in campaign but did cast a write-in vote himself.