(CNN) - The controversial removal of an Arizona state official charged with redrawing congressional districts was overturned Thursday by the state's Supreme Court.
Arizona Gov. Jan Brewer, a Republican, had sought to remove Colleen Mathis from her post as chair of Arizona's Independent Redistricting Commission, citing a “substantial neglect of duty, gross misconduct in office, or inability to discharge the duties of office.”
In a statement, Brewer called Thursday's decision "regrettable."
“With its reinstatement of the IRC Chairwoman, the Supreme Court has averted its eyes from the Commission’s misdeeds," Brewer said. "The Chairwoman’s actions to meet in secret, arrange critical votes in advance of meetings and twist the words and spirit of the Constitution have been forgiven – if not endorsed outright."
The Arizona Supreme Court determined in a ruling issued Thursday that claims against Mathis were unsubstantiated, and reinstated her to the redistricting board. The court said a fuller opinion on the matter would be forthcoming.
Brewer's decision to remove Mathis from the post was seen as a highly political move in Arizona. It came after Mathis' commission redrew congressional districts that Republicans claimed unfairly favored Democrats.
In a letter dated November 1, Arizona Secretary of State Ken Bennett wrote Mathis alerting her of her removal.
Bennett wrote Mathis had failed to "apply the Arizona Constitution's redistricting provisions in an honest, independent and impartial fashion, and [had failed] to uphold public confidence in the integrity of the redistricting process."
–CNN's Justin Lear contributed to this report.