Robert De Niro’s impassioned defense of Washington D.C. cops who protected the U.S. Capitol on Jan. 6, 2021 triggered supporters of former President Donald Trump, who surrounded the Oscar-winning actor as he left a press conference outside Manhattan criminal court Tuesday. The moment was captured on video — and shared byTrump on Truth Social. The MAGA supporters hurled insults at De Niro as he tried to leave a press conference condemning Trump’s re-election campaign outside the courthouse where the former president stands accused of falsifying business records to cover up hush money paid to an…