President Trump tweeted a fictional claim about WWI-era General John Pershing Thursday afternoon, telling his followers to "study it." This is one of several times Trump has cited the debunked claim about Pershing.
The fictional story he's referring to: Pershing, around the time of the Philippine-American War, killed 49 Muslims with bullets dipped in pigs' blood, and spared the 50th person so that he would take the last bullet to his people and tell them what happened.
Why? Trump has referenced this story repeatedly at rallies both during his campaign and his presidency as a way to give credence to his claim that the U.S. should "go much further" than waterboarding suspected terrorists.
Timing: The tweet came hours after a terrorist attack in Barcelona left at least 13 people dead and more than 50 injured.