07/28/2014 02:44 EDT | Updated 09/27/2014 05:59 EDT

Poker pros' cash hasn't freed defendants in Las Vegas illegal World Cup betting case

LAS VEGAS, Nev. - Lawyers in Las Vegas are asking immigration authorities to release a wealthy Malaysian businessman who was charged in a World Cup betting scheme and remains in custody even after his poker star friends posted his bail.

Fifty-year-old Wei Seng Phua and his 22-year-old son, Darren Phua, are among eight people charged with setting up an illegal sports book in a Caesars Palace villa and taking World Cup bets. Bail was set for $2 million for the father and $500,000 for the son.

Court records show poker professional Andrew Robl and 10-time World Series of Poker Champion Phil Ivey together posted $2.5 million to secure the Phuas' release.

But U.S. Immigration and Customs Enforcement put a hold on their release.

Phua's attorney tells the Las Vegas Review-Journal he'll challenge the detention.