Colin Kaepernick's Attorney QB Blackballed From NFL 'Cause Of Donald Trump
says he knows "beyond a shadow of a doubt" the NFL blackballed his client ... and it's entirely because of .
Kaep's attorney -- who's reppin' the former QB in his collusion case against the league -- revealed some of the ammo he's usin' to prove his case on Tuesday ... and he says it all starts and ends with Trump's disdain for anthem protests.
"[We] got an owner under penalty of perjury testifying that he changed his mind after he was told what Trump said," Geragos said.
The league's ... the ... the unwillingness to -- Geragos says it all stems from POTUS.
"The only reason -- and the owners will admit that -- they haven't signed [Kaepernick] is they're afraid of Trump, and they've colluded because of Trump."
Geragos added: "Basically, at this point, they've made the choice that they're going to opt on the side of the white, nationalistic side, as opposed to any other demographic."