Michigan State coach Tom Izzo was taught by his mentor, the late Jud Heathcote, to give back to the game by being part of the National Association of Basketball Coaches.

The Hall of Famer is choosing not to do that anymore.

A frustrated Izzo said Thursday that he was resigning from the NABC board of directors after nearly 18 years of service. He said he wanted to focus on his team and family, but he also blamed the NCAA for making what he called "arbitrary decisions" regarding waiver requests, including denying forward Joey Hauser's appeal to play this season.

"Joey did have a strong case, and I'm devastated," Izzo said.

Hauser transferred to Michigan State from Marquette in May and requested a waiver from the NCAA to be eligible immediately instead of sitting out the season, per usual transfer rules. The NCAA recently changed its waiver policy to give more undergraduate transfers a chance to become immediately eligible to compete.

"We opened Pandora's box, and maybe it will never be shut," Izzo said.

Ohio State quarterback Justin Fields is among the football players who received a waiver to play in 2019 after transferring following the 2018 season. Earlier this week, the NCAA cleared forward Gabe Osabuohien to play at West Virginia this season after approving his waiver request, and TCU got a boost when Ohio State transfer Jaedon LeDee was granted a waiver.

Izzo did not reference any specific decision the NCAA has made, but he said the governing body is relying on people outside of the game to make critical decisions.

"Joey didn't come here because he thought he was going to play right away," the coach said. "There was not even any talk about that. But as waivers started to pile up as the summer went on, Joey and his family felt they had a strong case. And I don't really appreciate when some people are getting waivers and other people aren't.

"All the research I've seen, the consistency and the guidelines for this seem absurd. There's arbitrary decisions being made. And what bothers me the most is they're being made by individuals who don't really understand what's going on in our game."

Izzo said he has tried to be a part of coming up with solutions as part of the NABC but stepped down from his role because he is fed up.

"I just don't believe I want to be dealing with these problems and banging my head against the wall," he said.

Jim Haney, the longtime executive director of the NABC, said Izzo is not the only frustrated coach.

"There's a lack of trust in terms of the process," Haney said. "Coaches look at stories about this kid becoming eligible immediately and then find out this kid is not and there's a lot of uncertainty. Tom deeply cares about the game and is a great steward. When his frustration comes to the point that he wants to disengage from the conversation, I think that says something significant."

A message seeking comment was left with the NCAA.

The 6-foot-9 Hauser, who is from Stevens Point, Wisconsin, averaged 9.7 points and 5.3 rebounds per game last season as a freshman.

The third-ranked Spartans play Virginia Tech next week in the Maui Invitational, where they will also face Dayton or Georgia and potentially No. 4 Kansas.

Information from The Associated Press was used in this report.