Bowsher and two other donors, whose aggregate contributions are estimated to total more than $1 million, told the Tribune they planned to stop contributing beyond current commitments until a change was made at athletic director.
Loss of financial support would come at a bad time for Illinois as it tries to raise funds for its Assembly Hall renovation project. Thomas said he didn't believe many donors had cut ties and hasn't had conversations with any who have.
"My university has been hijacked by a bunch of outsiders. I am absolutely furious," one of the big donors said. "I am absolutely finished. The checkbook is sealed. I am done.
"I don't know anyone who's excited or enamored with this current AD and the direction he is taking this administration. This isn't about Tim Beckman to me. ? I don't fault Tim Beckman for taking the job. It's obviously a terrific opportunity for him."
Bowsher is an Illinois alum who said he has been contributing time and money to the university for more than 20 years. His issues stretch well beyond the athletic department to the university board of trustees and former President Michael Hogan, but his experiences with Thomas have left him questioning his leadership ability.
"I don't think Mike Thomas is capable in any fashion," Bowsher said. "He's extremely weak from a personality standpoint. I don't see anything there that would tell me we would have success with him as athletic director."