Gary Johnson reportedly once asked an aide: 'Who's Harriet Tubman?'

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Call it a "Tubman moment."

Gary Johnson, the gaffe-prone Libertarian candidate for president, seemingly has a tendency to forget things.

Months before Johnson failed to recall what Aleppo is — Syria's largest city, and one of the hardest hit by the ongoing civil war — during an interview with MSNBC, he apparently had to ask an aide who Harriet Tubman was.

The nugget is buried in a long New Yorker profile from July about Johnson's third-party candidacy for the White House.

After giving a speech at a libertarian political convention in California, Johnson was questioned as to whether diversity was "a problem" for the Libertarian Party, which is mostly young, white, and male.

He responded that his party would start doing better among non-white voters once he became more nationally recognized.

Shortly thereafter, Johnson was shepherded into a room at the convention center that was named after Harriet Tubman.

"Who's Harriet Tubman?" Johnson asked an aide. The aide had to quietly remind Johnson who Tubman was.

Harriet Tubman, Women on 20sMSNBC

Tubman, of course, is an American civil rights icon. Born into slavery, she served as an armed scout for the Union army during the Civil War, and fought for women's suffrage. Tubman's face will grace the newest iteration of the $20 bill.

But clearly, that wasn't the end of Johnson's troubles.

On Wednesday, Johnson admitted to MSNBC's Chris Matthews he was having an "Aleppo moment" when he couldn't immediately name any foreign leaders he respected.

He doubled down on his inability to name any foreign leaders in a tweet on Thursday, saying, "It's been almost 24 hours... and I still can't come up with a foreign leader I look up to."

While Johnson has had some trouble getting his poll numbers up to a comfortable level, The Chicago Tribune did endorse him for president on Friday.

Gary Johnson's campaign wasn't immediately available for comment.

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See images of Gary Johnson:

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Gary Johnson through the years
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Gary Johnson through the years
UNITED STATES - MARCH 3: Gov. Gary Johnson, former Governor of NM, speaks at the American Conservative Union's CPAC conference at National Harbor in Oxon Hill, Md., on Thursday, March 3, 2016. (Photo By Bill Clark/CQ Roll Call)
UNITED STATES - FEBRUARY 26: Former New Mexico Gov. Gary Johnson pretends to have a heart attack on stage while arguing in favor of legalization of marijuana during CPAC in National Harbor, Md., on Feb. 26, 2015. Former Rep. Ann Marie Buerkle, R-N.Y., not pictured, had just argued during their debate that marijuana caused an increased risk of heart attacks. (Photo By Bill Clark/CQ Roll Call)
ORLANDO, FL - SEPTEMBER 22: Former New Mexico Gov. Gary Johnson speaks in the Fox News/Google GOP Debate at the Orange County Convention Center on September 22, 2011 in Orlando, Florida. The debate featured the nine Republican candidates two days before the Florida straw poll. (Photo by Mark Wilson/Getty Images)
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