Trump used an accident in which a Border Patrol agent was killed to inflame anti-immigrant sentiment. Trump and other Republicans treated this as an attack on the agent but there has been no proof of that. The FBI conducted over 650 interviews.
Now that we know that Trump’s story is not true, will he retract it? Of course not. He never acknowledges that he ever lies. The original unsupported story got much more publicity than the results of the investigation. Sad!