JEFFERSON CITY, Mo. — Missouri Gov. Eric Greitens initiated a physically aggressive unwanted sexual encounter with his hairdresser and threatened to distribute a partially nude photo of her if she spoke about it, according to testimony from the woman released Wednesday by a House investigatory committee.

The graphic report details multiple instances in which the woman said Greitens spanked, slapped, grabbed, shoved and called her derogatory names during a series of sexual encounters as he was preparing to run for office in 2015. The testimony contradicts Greitens' previous assertions that "there was no violence" and "no threat of violence" in what he has described as a consensual extramarital affair.

The report, signed by all five Republicans and two Democrats on the committee, describes the woman's testimony as credible and notes that Greitens has so far declined to testify or provide documents to the panel. It also outlines instances where the Republican governor's public comments appear to run counter to some of her allegations.

Flanked by other top Republican legislative leaders, House Speaker Todd Richardson announced that the special committee will expand its mission and make recommendations after the May 18 end of the regular legislative session on whether to pursue impeachment proceedings seeking to remove Greitens from office. He said legislators will take steps to call themselves into a special session.

The special House investigation was initiated shortly after Greitens was indicted in February on a felony invasion-of-privacy charge for taking a nonconsensual photo of the partially nude woman and transmitting it in a way that could be accessed by a computer. The woman told the committee that Greitens took the photo after manipulating her into a compromising position during an unwanted sexual encounter and that he told her, "Everyone will know what a little whore you are" if she told anyone about him.

Greitens, 44, has refused to directly answer media questions about whether he took the photo but he has steadfastly denied any criminal wrongdoing. He said he expects to be proven innocent during this trial, which is scheduled for May 14.

Speaking shortly before the report was released, Greitens told reporters gathered at the Capitol that he expected it to contain "lies and falsehoods" and reaffirmed his commitment to remaining in office.

"This is a political witch hunt," Greitens said, later adding: "This is exactly like what's happening with the witch hunts in Washington, D.C."

Richardson called the women's testimony "beyond disturbing" and defended the integrity of the investigation. He said: "Let me be very clear about this: This is not a witch hunt, and the committee had no political agenda."

If the House were to impeach Greitens, the Senate then would choose seven jurists to conduct a trial on whether Greitens should be ousted. The impeachment process can occur independently of a criminal case.

Democratic House and Senate leaders immediately called on Greitens to resign or face impeachment.

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According to the report, the woman testified that she met Greitens in 2013 as a customer of her hair salon. She said she had a crush on Greitens but was shocked when he ran his hand up her leg and touched her crotch without her consent during a March 2015 hair appointment. He later invited her to his St. Louis home while his wife was out of town.

After she arrived through the back door, the report said that the woman testified Greitens searched her purse and "patted her down from head-to-toe." He then asked if she had exercised and had her change into a white T-shirt with a slit on the top and pajama pants.

"I thought, oh, this is going to be some sort of sexy workout," the woman testified.

But once in his basement, Greitens taped her hands to pull-up rings, blindfolded her, started kissing her, ripped open the shirt and pulled down her pants, the woman testified. She didn't give consent to be disrobed or kissed, the report said. The woman testified that she then heard a click, like of a cellphone picture, and saw a flash.

The woman testified that Greitens told her: "Don't even mention my name to anybody at all, because if you do, I'm going to take these pictures, and I'm going to put them everywhere I can. They are going to be everywhere, and then everyone will know what a little whore you are."

When she remained silent, the woman said Greitens "spanked me and said, 'Are you going to mention my name?' And I said, I just gritted through my teeth, and I said, 'No.' And he's like, 'Good, now that's a good girl.'"

"I was definitely fearful," the woman testified to the legislative committee.

After telling Greitens, "I don't want this," the woman testified that Greitens unbound her hands. She said she started "uncontrollably crying." She said Greitens then grabbed her in a hug and laid her down. She said he put his penis near her face and she gave him oral sex. Asked by the committee whether the oral sex was coerced, she responded: "Coerced, maybe. I felt as though that would allow me to leave."

The woman testified she returned to Greitens' house later that day because she had forgotten her keys. She said she confronted him about taking a photo and he responded: "You have to understand, I'm running for office, and people will get me, and I have to have some sort of thing to protect myself." Then she said Greitens added: "I felt bad, so I erased it."

Democrats from a special committee investigating Missouri Gov. Eric Greiten's affair speak at a press conference in Jefferson City, Mo., on Wednesday. J.B. Forbes / St. Louis Post-Dispatch, via AP

The House committee report said it doesn't possess any physical or electronic evidence of the photo.

The woman testified that she had several additional sexual encounters with Greitens, including one in June 2015 when "he slapped me across my face" after she acknowledged having slept with her husband. She said she didn't think Greitens was trying to hurt her, but rather "I felt like he was trying to claim me."

In another subsequent sexual encounter, the woman testified that Greitens "out of nowhere just, like kind of smacked me and grabbed me and shoved me down on the ground, and I instantly just started bawling."

It "actually hurt, and I know that I actually was really scared and sad when that happened," she testified.

The woman's account contradicts statements Greitens made previously. Asked in a January interview with The Associated Press if he had ever slapped the woman, Greitens responded: "Absolutely not."

Greitens, a Rhodes Scholar and former Navy SEAL officer, was considered a rising GOP star. He went so far as to reserve the web address ericgreitensforpresident.com years ago.

Greitens first acknowledged having an extramarital affair on Jan. 10, when St. Louis TV station KMOV ran a story revealing that the woman's ex-husband had released a secret audio recording of a 2015 conversation in which she told him about the photo Greitens took at his home.

Greitens' attorneys have asserted that prosecutors have failed to produce evidence that a photo exists. Prosecutors previously acknowledged that they don't have the photo, though they could be trying to obtain it.

On Wednesday, Greitens referenced a comment the woman made during a lengthy deposition in the criminal case when she was asked if she saw what she believed to be a phone. A court filing from Greitens' attorneys quoted her as saying, "I haven't talked about it because I don't know if it's because I'm remembering it through a dream or I — I'm not sure, but yes, I feel like I saw it after that happened."

Greitens and his defense team have seized on the "dream" comment to attack the credibility of her testimony. But the prosecutor in the case says the defense "cherry picked bits and pieces" of her nine-hour deposition and the woman's attorney says it referred to one particular instance concerning the photo.

Greitens' attorneys had tried to persuade the Legislature to delay its report until after his criminal trial, arguing that it could include some information that isn't fully accurate and could taint the jury pool.

On Wednesday, Greitens criticized the House report as "one-sided tabloid, trash gossip that was produced in a secret room."

In addition to the legislative investigation and the criminal case, Republican Attorney General Josh Hawley is investigating The Mission Continues, the veterans charity founded by Greitens, as it relates to the state's consumer protection and charitable registration and reporting laws. That probe came after media reports that Greitens' campaign had obtained and used a charity donor list in 2015 as it ramped up fundraising for his gubernatorial bid.