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Less than a week after tweeting a campaign poster that confused men dressed in Nazi uniforms for American soldiers, Donald Trump is proving once again he is in fact not a “really smart person.”

Last night, the real estate mogul fell for an internet prank by retweeting a photo of Jeffrey MacDonald, the former army doctor who in 1979 was convicted of killing his pregnant wife and two daughters. Trump evidently confused the original tweet for an endorsement amid the backlash sparked by his comments mocking Sen. John McCain’s military record.

“@russiannavyblog: @ConnorBaldwin21 My bad ass Vietnam vet dad has balls too which is why he’s voting Trump! pic.twitter.com/iTrpfISThL“ — Donald J. Trump (@realDonaldTrump) July 21, 2015

Nazi photos aside, this is far from the first time Trump has committed a social media gaffe. Last September, Trump fell for yet another stunt after retweeting a photo with the message, “My parents who passed away always said you were a big inspiration. Can you please RT for their memory?” The resulting retweet posted a photo of two infamous serial killers.

Though his latest remarks appeared to dip his polling numbers, Trump continues to lead polls of the Republican primary.