A Donald Trump spokesperson just got caught trying to blame Barack Obama for something he couldn’t possibly have had anything to do with, and Twitter is not letting her live it down.

Katrina Pierson appeared on CNN for an interview with Wolf Blitzer about Trump’s continued war of words with the parents of slain soldier Capt. Humayun Khan, and said Obama’s changes to the “rules of engagement” in Iraq likely cost the soldier his life.

The only problem, of course, is that Khan died in 2004, when George W. Bush was president, and Obama was just a state senator in Illinois.

Also Read: Could the Khan Family Spell the End of Donald Trump?

Twitter caught on to the goof right away, and devised the hashtag #KatrinaPiersonHistory, which is being used to place blame for other historical events on Obama.

“The South was totally winning the Civil War, but then Obama issued a ‘Stand down’ order,” joked one user.

“According to Trump spox Katrina Pierson, were it not for President Obama’s failed policies, Abraham Lincoln would still be alive,” said another.

Also Read: Veteran Groups, Gold Star Families Condemn Donald Trump Over Attacks on Khan Family

Critics say Trump went too far when he attacked Humayun’s parents Khizr and Ghazala Khan, whose son died after saving hundreds of his fellow soldiers.

Khizr Khan — who criticized Trump for his proposed ban on Muslims entering the U.S. during the Democratic National Convention in Philadelphia last week — is now appealing to Republican voters, urging them to disavow their nominee.

“This candidate is void of empathy, so I will continue to reach out to Republican voters to refrain from voting for this candidate,” Khan told NBC News on Monday. “He needs to mend his way.”

Also Read: Veteran Groups, Gold Star Families Condemn Donald Trump Over Attacks on Khan Family

Read tweets lampooning Pierson’s misstatement below.

Ronald Reagan is alive, and is living in Russia under the alias "Vladimir Putin" #KatrinaPiersonHistory — Dreamweasel (@Dreamweasel) August 3, 2016

He was warned about that asteroid, but when it came time to act, he let millions of endangered dinosaurs die. #KatrinaPiersonHistory — Justice Wainwright (@JusticeBlaine) August 3, 2016

#KatrinaPiersonHistory Obama mixed the cool aid at Jonestown — Mya Buttreaks (@MButtreaks) August 3, 2016

"We would have won the Vietnam War if it wasn't for Obama" – Katrina Pierson — Just Maybe (@ShomahKhoobi) August 3, 2016

#KatrinaPiersonHistory The South was totally winning the Civil War, but then Obama issued a "Stand down" order. — Sarah Reese Jones (@PoliticusSarah) August 3, 2016

According to Trump spox Katrina Pierson, were it not for President Obama's failed policies, Abraham Lincoln would still be alive. — RUSS BENGT$ON (@russbengtson) August 2, 2016

Katrina Pierson explaining to @wolfblitzer that #Obama invented time travel, went back in time and killed Cap. Kahn and then brought Zika. — Girls Really Rule. (@girlsreallyrule) August 2, 2016

How can you be so dense, shameless, and clueless, @KatrinaPierson that you actually make that baboon Trump look worse? — Keith Olbermann (@KeithOlbermann) August 2, 2016

#KatrinaPiersonHistory Obama was on the grassy knoll in Dallas and Katrina has a copy of his ticket from Kenya to Dallas — Tony Huffman (@huffman_tony) August 3, 2016

The last dinosaur died in 1956 , shot by a young Dick Cheney #KatrinaPiersonHistory pic.twitter.com/lzc37rXURt — St Peter (@stpeteyontweety) August 3, 2016

Obama started 14th century Europe's Black Death pandemic, causing 75 million deaths. Because, you know, BLACK. #KatrinaPiersonHistory — Simon Ford (@SimonFordComedy) August 3, 2016

Obama knew about that iceberg but didn't warn the captain of the Titanic #KatrinaPiersonHistory — Tara Rodham Dublin (@taradublinrocks) August 3, 2016

#KatrinaPiersonHistory Obama is the real reason why Lucy always had so much splainin' to do to Ricky. pic.twitter.com/Sh9HFCSVV1 — The Hashtag Game (@TheHashtagGame) August 3, 2016

#KatrinaPiersonHistory Obama is the reason why Raymond Babbitt kept missing Wapner. Definitely. Yeah, Definitely. pic.twitter.com/4WyA9pYHER — The Hashtag Game (@TheHashtagGame) August 3, 2016

Obama gave Amelia Earhart directions to Kenya. #KatrinaPiersonHistory pic.twitter.com/OS7uJ1YCMy — Scott Wooledge (@Clarknt67) August 3, 2016

#KatrinaPiersonHistory Obama introduced John Lennon to Yoko Ono and well, you know… pic.twitter.com/Hr7HExbhPr — EGCollins (@EGCollins) August 3, 2016

Obama totally started chowing down before the Lord said grace. #KatrinaPiersonHistory pic.twitter.com/QmkkZsm3lK — Sha (@quip1) August 3, 2016