Federal prosecutors have accused Collins of passing along sensitive information to family members while he sat on the board of Australian-based Innate Immunotherapeutics.
Congressman Collins is accused of insider trading.
At issue is whether the government must prove that the source of tips received a tangible benefit in order to prevail on insider trading cases.
Mickelson doesn't face charges, and has said he will return $931,000 the SEC alleges he made illegally.
Why the unregulated daily fantasy industry smells so fishy the past week.
The U.S. Supreme Court refused to delay a conviction for insider trading