United Auto Workers' President Gary Jones announced on Saturday that he is taking a leave of absence after a vote by the union's executive board amid a widening federal corruption probe into the union.

"The UAW is fighting tooth and nail to ensure our members have a brighter future. I do not want anything to distract from the mission. I want to do what's best for the members of this great union," Jones said in a statement on Saturday. 

The union has been accused by federal prosectors of corruption amid labor contract negotiations with General Motors (GM) - Get Report and Ford (F) - Get Report . IRS and FBI agents raided Jones' home in August, one of several targets in a multi-state raid.

Jones has not been charged with any crimes. Twelve people have been charged in the corruption investigation, including Edward Robinson, a union official with ties to Jones, according to Reuters. 

Robinson has been accused of conspiring with union leaders to "embezzle, steal, and unlawfully and willfully abstract" more than $1.5 million from the union for personal gain, according to a criminal filing.

The UAW secured a four-year labor contract with General Motors after a 40-day strike that cost the automaker as much as $4 billion for the year and $1 billion in the third quarter.

Jones also oversaw a much-quicker tentative agreement with Ford, which is expected to be ratified shortly. The UAW will next begin negotiations with Fiat Chrysler (FCAU) - Get Report .