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“This was an unintentional oversight and I regret any inconvenience this may cause,” Akin wrote in a letter to the House Ethics committee, which was obtained by the Post-Dispatch.

Akin is receiving pension payments from his time as a Missouri state legislator. Sen. Claire McCaskillClaire Conner McCaskillConservative group calls for ethics probe into McCaskill’s use of private plane Senate moderates hunt for compromise on family separation bill Election Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral MORE (D-Mo.), who Akin is running to unseat, also receives a state pension from her time in Missouri state government.

Akin last year had to amend disclosure forms to reflect hundreds of thousands in property assets from 2010 that he had also failed to disclose.