Senate Majority Leader Mike Duffy, D-Wis., announced Thursday that he will not seek re-election in 2018.
“I would be lying if I said that I didn’t feel bad about this decision,” he said in a statement.
“But I want to be clear: I have made my decision to focus on my life as I see fit and my family.”
The Republican also took to Twitter to say he “never took a bribe to be in public office.”
Senate Republicans voted to confirm him to his current job in January after he paid a $10,000 fine and pleaded guilty to fraud in the 2016 federal election.
Duffy will have to forfeit $25,000 in campaign contributions and pay a $50,000 penalty.
He will also have to repay $6,500 in legal fees.
The announcement comes after a string of allegations against him.
The allegations included that Duffy failed to report tens of thousands of dollars in donations from foreign governments and corporations while on the Senate floor.
The former Conservative senator also pleaded guilty in 2016 to receiving campaign contributions from an illegal entity, a violation of the Conflict of Interest Act.