US Libertarian presidential candidate Gary Johnson is once again the subject of ridicule after he blanked when asked to name the world leader he most admired.
The former New Mexico governor was thrust into the social media spotlight earlier this month when he asked an interviewer, "What is Aleppo?", when asked to comment on the conflict there.
The questioned spurred the viral tag #WhatisAleppo and caused people to question his knowledge of foreign affairs.
It is question likely to rise again of what he himself has termed an "Aleppo moment".
MSNBC Hardball host Chris Matthews asked Johnson to name the world leader he most admired - a question which stumped the former Republican who failed to come up with the name of a single leader.
Perhaps, in an attempt to give Johnson more time, his running mate Bill Weld immediately volunteered the late Israeli leader Shimon Perez as his favourite.
But Matthews was having none of it and pushed Johnson again: "You gotta do this, anywhere, any continent, Canada, Mexico, Europe, Asia, South America, Africa - name a foreign leader that you respect".
"I guess I'm having an Aleppo moment," Johnson replied, outraging Matthews.
"But I'm giving you the whole world," he said.
"Anybody in the world you like. Pick anybody."
Johnson tried again, but a name continued to elude him.
"The former president of Mexico," he eventually mustered.
But Matthews wasn't satisfied, demanding, "Which one?"
"I'm having a brain fart," Johnson said before Weld offered Vincente Fox who served as Mexico's president from 2000 to 2006.
The interview did not get much better.
Johnson struggled over a question about his nominated favourite president Thomas Jefferson and was unable to name his favourite sitting Supreme Court justice.
He was instead reduced to copying Weld's nomination of senior Associate Justice Anthony Kennedy.
Social media users slammed Johnson's performance online.
Johnson has been pushing hard to reach the 15 per cent polling target that would allow him to be included in the leaders debates with Democrat candidate Hillary Clinton and Republican candidate Donald Trump.
While often left out of official polls, earlier this month he was sitting at about 13 per cent.
