WATCH: GOP Senate candidate mocks Colin Kaepernick for being blackballed by the NFL during Trump’s rally
Colin Kaepernick. (Brook Ward/Flickr)

During a campaign appearance with President Donald Trump, Rep. Lou Barletta (R-PA) mocked civil rights icon Colin Kaepernick.

Kaepernick, a former star quarterback who took the San Francisco 49ers to the Superbowl, has filed a "collusion" lawsuit against the National Football league, alleging he is being blackballed by owners because of President Donald Trump's influence.

The lawsuit has already uncovered evidence that that NFL teams viewed Kaepernick as starting quarterback material.

Secret recordings revealed NFL owners feared Trump would attack them for giving Kaepernick a job.

Trump called Kaepernick a "son of a b*tch" for kneeling during the national anthem to protest police brutality against people of color. The remarks by Trump were made at a 2017 campaign rally in Alabama for alleged child molester Roy Moore.

Appearing alongside Trump in Pennsylvania on Wednesday, Rep. Barletta mocked Kaepernick.

"This economy is so good that even Colin Kaepernick found a job," Rep. Barletta joked.

While Kaepernick has not been signed by a team, he did get an endorsement contract with Nike, that celebrates his selfless support for civil rights.

Conservative outrage over the ad backfired as Nike stock closed at an all-time high.

Rep. Barletta is challenging Sen. Bob Casey (R-PA) in the 2018 midterm elections.