Dallas Cowboys owner Jerry Jones is threatening a lawsuit against the National Football League if it decides to extend Commissioner Roger Goodell's contract beyond the 2018 season.

Multiple reports Wednesday said Jones has already hired David Boies, a lawyer from New York who has represented the likes of former Vice President Al Gore and Hollywood producer Harvey Weinstein.

Sources told ESPN that Jones is particularly upset with Goodell due to his handling of players protesting the national anthem as well as the NFL's pending suspension of Cowboys running back Ezekiel Elliott over alleged domestic violence.

The frustration Jones has on the issue appears to be shared by other owners.

"Most owners would admit that Roger has done a terrible job handling the anthem controversy and a terrible job explaining the [TV] ratings declines, a terrible job on any number of other issues," an unnamed, long-time team executive told ESPN.

Jones declared in October that members of his team were forbidden from kneeling during the national anthem because that would be "disrespecting the flag." Players who disobeyed would be blocked from playing.

The demonstrations, started last season by former San Francisco 49ers Colin Kaepernick to bring attention to injustice against minorities, became a major issue this season when President Trump called on NFL team owners to fire players who take a knee during the anthem.

Goodell announced last month that he believed that players should stand for the national anthem, but that the league would not force them to do so.

ESPN previously reported that the ongoing controversy was a sticking point at an owners meeting in New York that same month which kept them from finalizing a contract extension.