Presidential nominee Gary Johnson's second 'Aleppo moment'

Gary Johnson (Reuters)
Gary Johnson (Reuters)

US presidential candidate Gary Johnson's had another "Aleppo moment".

Three weeks after asking a news host "what is Aleppo?", Mr Johnson has had another excruciating brain freeze live on TV.

MSNBC host Chris Matthews asked the Libertarian nominee to name a foreign leader he respected. Mr Johnson hesitated.

"Go ahead, you've got to do this. Anywhere, any continent, Canada, Mexico, Europe over there, Asia, South America, Africa - name a foreign leader that you respect," Mr Matthews prompted.

"I guess I'm having an Aleppo moment," replied Mr Johnson, before suggesting "the former President of Mexico".

"Which one?" asked Mr Matthews.

Mr Johnson still couldn't name anyone. His running mate Bill Weld butted in to suggest Vincente Fox, who ran the United States' southern neighbour from 2000 to 2006.

Aleppo is the city at the centre of the Syrian civil war. The US and Russia have been at loggerheads over how to end the fighting, but again it seems Mr Johnson has not been paying attention.

Mr Johnson is polling around 8 percent, well behind Donald Trump and Hillary Clinton, who are in the 40s.