A U.S. Senator is accusing LeBron James of promoting extreme violence in America -- the NBA superstar's controversial "You're Next" post was a hot button issue Wednesday in a Senate hearing.

Sen. John Kennedy called out LeBron during the hearing on domestic violence extremism, referencing his infamous tweet about the cop who shot and killed 16-year-old Ma'Khia Bryant in Columbus, Ohio.

As you know ... LeBron published and then deleted the tweet last month, but not before explaining that he meant the officer should be prosecuted like Derek Chauvin. His explanation fell on many deaf ears, as he's catching heat from politicians, like Sen. Tom Cotton, former President Trump ... and now Kennedy.