FBI agent and bodybuilder investigating Gretchen Whitmer kidnap plot is arrested after 'beating his wife during argument following night at a swingers' party'

• FBI agent Richard Trask, 39, has been a key figure in the case of Whitmer plotters
• In October 14 people were arrested and charged with planning to kidnap her
• The case is among most important against domestic extremists in a generation
• On Sunday Trask was arrested and charged with attacking his wife at home
• He is charged with assault with intent to do great bodily harm, less than murder
• Trask was released on a $10,000 bond and faces up to 10 years in prison

An FBI agent who has played a key role in the prosecution of more than a dozen 'militia' members who plotted to kidnap Michigan's governor, was arrested on Sunday morning after allegedly attacking his wife following a swinger's party.

Richard Trask, 39, allegedly smashed his wife's head against a nightstand during an argument after the party, leaving her covered in blood.

She attempted to grab his beard to free herself, and he began to choke her around the neck and throat, according to an arrest affidavit obtained by The Detroit News.

She ultimately grabbed Trask's testicles, which ended the altercation, the document notes, and Trask left their Oshtemo Township home in her vehicle.

Richard Trask, a FBI agent since 2011, was arrested on Sunday after he had attended a swinger's party in Kalamazoo, Michigan with his wife. They argued about it and on their return home had a physical fight, leaving her bloodied and bruised. He was charged on Monday

Trask owns a gym at his rural Michigan property, in addition to being an FBI agent

Trask has worked on cases involving espionage, terrorism and domestic extremism investigations

He was a key figure in efforts to make a case against 14 men who plotted to kidnap Governor Gretchen Whitmer (pictured) in October. His arrest is a deeply worrying development for the prosecution

Trask, a gym owner who has worked for the FBI since 2011, was tracked down in the parking lot of a supermarket on Main Street in Oshtemo Township, near Kalamazoo.

He is charged with assault with intent to do great bodily harm, less than murder. Trask was released on a $10,000 bail and is prohibited from carrying a firearm.

Trask's wife said that they had several drinks at a swingers' party held at a hotel in Oshtemo Township.

She did not like the party and they argued about it on the way home.

When they got back, they had a physical fight.

Kalamazoo County Sheriff's Office said Trask's wife had cuts to the right side of her head and 'blood all over chest, clothing arms and hand,' as well as 'severe' bruising to her neck and throat.

FBI spokeswoman Mara Schneider on Monday said the bureau is cooperating with the prosecutor's office.

Trask has worked on cases involving espionage, terrorism and domestic extremism investigations, but his job status now is unclear.

'In accordance with FBI policy, the incident is subject to...

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