Oscar De La Hoya says he's known Donald Trump for decades -- and says he "truly feels" his old friend's antics are simply an act in a diabolical plot to get Hillary Clinton elected.
He's dead serious.
Oscar joined the guys on the "TMZ Sports" TV show on FS1 -- and brought up Trump ... saying Donald inspired him to put together his upcoming superfight between Canelo Alvarez and Amir Khan because they both come from backgrounds that Trump has targeted in his campaign.
Amir is Muslim and Canelo is Mexican ... and Oscar says, "Let me put them in there and create this big mega event and show Trump that we belong in this country."
They fight in Vegas on May 7th.
De La Hoya says MUCH MUCH MORE -- you have to watch the entire interview Wednesday night on "TMZ Sports" on FS1.