(NewsNation) — Former NBA referee Tim Donaghy is unsurprised that a current NBA player and coach were among more than 30 people arrested Thursday in connection with a federal probe into sports gambling and rigged poker games.

Donaghy served 15 months in prison after pleading guilty to wire fraud and transmitting betting information for taking thousands of dollars from a gambler for inside tips on games in 2008.

He joined "CUOMO" to discuss the arrest and alleged involvement of Portland Trail Blazers head coach Chauncey Billups and Miami Heat guard Terry Rozier, and the Mafia.

"Definitely not surprised with what's going on. I think this is just the tip of the iceberg," Donaghy told NewsNation.

In fact, he believes there is greater potential for a larger gambling scandal at the college s

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