Donald Trump repeated his debunked story about General John Pershing shooting Muslims with pig’s blood at a large California rally Thursday.

According to Trump, around the time of the Philippine-American War of 1899-1902, Pershing killed 49 Muslims with bullets dipped in pigs blood, and “the fiftieth person, they said, ‘Take this bullet and bring to back to all of the people causing the problem,’” said Trump in Costa Mesa, CA. “And for 42 years they didn’t have a problem.”

Read More: The Real Story Behind Donald Trump’s Pig’s Blood Slander

For Muslims, ingesting pork is a sin, and pig’s blood is considered unholy. But as I reported back in February after another rally where Trump told the tale, it isn’t true. Brian McAllister Linn, a history professor at Texas A&M University who is an expert in the Philippine conflict, remembers looking into this story with Frank Vandiver, who wrote a biography of Pershing and passed away in 2005.

“We both checked our notes and found no evidence to support this,” Linn told TIME. “We also concluded it was out of character.”

Get our Politics Newsletter. The headlines out of Washington never seem to slow. Subscribe to The D.C. Brief to make sense of what matters most. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Write to Tessa Berenson at tessa.berenson@time.com.