|Muhammad Ali and Spike Lee may be among several celebrities called as character witnesses in actor Wesley Snipes' tax fraud and conspiracy trial.
Snipes faces up to 16 years in prison if convicted.
During jury selection in Florida, Snipes' lawyers listed more than 70 potential witnesses, including actors Woody Harrelson and Sylvester Stallone and director Gus Van Sant.
Journalists Tom Brokaw and Barbara Walters could also be called.
Snipes and two co-defendants, both known tax protesters, are accused of conspiring to defraud the US of millions of dollars.
Snipes allegedly first collaborated with Eddie Ray Kahn and Douglas Rosile in 2000, then stopped filing tax returns. Prosecutors say he fraudulently tried to retrieve 11 million dollars (�5.6m)in paid 1996 and 1997 taxes and directed his film companies to stop withholding taxes from employees.
Kahn and Rosile face up to 10 years if convicted.