It was a stunning fall from grace for the military veteran and Rhodes scholar once rumored to be considering an eventual run for the presidency. 

Missouri State Governor Eric Greitens has resigned amid expanding investigations of a sex scandal and potential violations of campaign finance laws.  

The Midwestern US state’s legislature, controlled by the governor’s own party, was in the midst of a special session to consider whether Greitens should be impeached, when the governor announced his resignation would be effective Friday evening.

“This ordeal has been designed to cause an incredible amount of strain on my family,” said the defiant governor, who had repeatedly called the investigations against him a “witch hunt”.

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“I have not broken any laws or committed any offense worthy of this treatment,” he added at a brief news conference, at one point clearly holding back tears.

Greitens’s troubles had mushroomed over revelations of a 2015 extra-marital affair and charges, which he vehemently disputed, that he attempted to blackmail his mistress into silence with a compromising semi-nude photo.  

The state legislature’s investigation had expanded to probe potential campaign finance violations, as questions swirled about whether the governor’s campaign illegally coordinated with a non-profit organization to conceal the identity of political donors.  

The governor’s decision came after a judge compelled Greitens to release information about A New Missouri and any communications or coordination between the group and his own campaign fund, according to the St Louis Post-Dispatch newspaper.