ANN ARBOR, MI - The proposed appearance of white nationalist Richard Spencer at the University of Michigan may never happen.

After Spencer's March 5 appearance at Michigan State University turned violent, with clashes between white nationalists and antifascist protesters, Spencer says he is rethinking his approach to speaking on college campuses.

In a lengthy video he posted on YouTube Sunday, March 11 titled "College Tour Course Correction," Spencer questioned if he would be able to continue speaking in public venues on college campuses due to the escalation of violence that coincides with his events.

"The fact is, until this situation changes, we are up a creek without a paddle," Spencer said. "The college tour is not about pitched battles, it is about intellectual activity and, until something changes, I'm going to have to rethink how I do this.

"The fact is, at least for the foreseeable future, I don't think it's a good idea for me to host an event that's wide open to the public in which we name the date and the time," he added. "Because if we do that in advance, Antifa are going to do their thing, and if the campus police and the state police and local police aren't ultimately willing to open up a corridor, then I don't simply want to repeat Michigan (State)."

Spencer's appearance at Michigan State University resulted in 25 people being arrested, according to MSU police. Thirteen of the arrests were for felony charges, including resisting and obstructing police officers and carrying a concealed weapon.

Throughout the video, Spencer referred to violent clashes he claims were initiated by Antifa, who were blocking a path for his supporters to enter the MSU Pavilion for Agriculture and Livestock Education where he was scheduled to speak.

Hundreds of people turned out to protest the appearance of Spencer, a leading figure in the white nationalist movement who has been credited with coining the term "alt-right." He's advocated for an "ethno-state" that would expel minorities.

More than 100 law enforcement officers attempted to provide a path for Spencer's supporters to enter the MSU venue, but some were deterred in what he described "was effectively a riot for a period."

"The idea of the college tour was to engage with students, perhaps faculty, and for these things to be controversial and edgy, but also fun," Spencer said. "When they become violent clashes and pitched battles, they aren't fun. This isn't what the college tour is really about.

"I really hate to say this, and I definitely hesitate to say this, but Antifa is winning to the extent that they are willing to go further than anyone else," he added.

While he didn't detail any specific plans to cancel a requested appearance at UM, Spencer's remarks place doubt about if his visit to the Ann Arbor campus will happen.

UM announced in January it would not host Spencer this semester, but would continue to consider a request from his representatives to rent space to speak on campus. No potential dates are being considered before the end of the academic year on April 28.

Spencer's National Policy Institute could not be reached for comment regarding the status of the request to speak at UM. University spokesman Rick Fitzgerald said he viewed the video Sunday, describing it as "sufficiently vague on the path forward," adding that the university had nothing new to share on the status of the speaking request.

Spencer urged his supporters to be patient as he reconsiders how he'll approach future speaking engagements, suggesting he still wanted to be "doing things publicly, but doing them in a different way."

"We felt that great feeling of winning for a long time," Spencer said. "We're now in something that feels like a hard struggle and victories aren't easy to come by."