Ex-NFL star says Trump friendship has cost him

Retired NFL player Herschel Walker says he's being dropped from speaking engagements because of his relationship with Donald Trump.

Herschel Walker, NFL great & former MMA Fighter, speaks at a press conference to show support of professional fighters study at Cleveland Clinic Lou Ruvo Center for Brain Health. (Photo by Paul Morigi/Getty Images for Spike TV)

In an interview on the "TMZ Sports" TV show, the Heisman Trophy winner and former "Celebrity Apprentice" contestant said he's known Trump "before he became `The Donald."' Walker said the presumptive Republican nominee is not racist.

Walker told TMZ Sports "just because you build a wall, doesn't mean you're a racist."

Trump has faced sharp criticism for his statements on immigration and plan to build a wall along the U.S. border with Mexico.