WASHINGTON (AP) — Joe Biden said Friday that the “open wound” of systemic racism was behind the police killing of a handcuffed black man in Minnesota.

Biden also accused President Donald Trump, without mentioning him by name, of inciting violence with a tweet that warned that protesters could be shot.

Biden said he spoke to the family of George Floyd, a handcuffed black man who was killed in Minneapolis this week after a white police officer knelt on his neck.

The former vice president said now was “no time for incendiary tweets.

But the president later warned online that protesters could be shot, prompting Twitter to flag his tweet as glorifying violence.