Colin Kaepernick's lawyers are expected to seek federal subpoenas of President Trump and Vice President Pence in Kaepernick's collusion case against the NFL in an attempt to gain more information about the administration's contact with league owners over the league's national anthem protests, reports Yahoo Sports.

The big picture: Recordings released earlier this year revealed NFL team owners are terrified of Trump speaking out against the league because of player protests during the national anthem. That forced a rule change from the league, requiring players on the field during the anthem to stand, propelling the issue back into the zeitgeist and culminating with Trump's decision to disinvite the Super Bowl champion Philadelphia Eagles from the White House earlier this week.

Kaepernick has gone unsigned since the anthem protests gained steam, leading some players in the league to suspect that he's been blackballed by owners. As player Eric Reid stated during last year's player-owner meeting:

“I feel like he was hung out to dry. Everyone in here is talking about how much they support us. Nobody stepped up and said we support Colin’s right to do this. We all let him become public enemy number one in this country, and he still doesn’t have a job.”

The problem: Getting testimony from Trump won't be easy for Kaepernick and his lawyers.