snowball's chance

Earlier this week, Trudeau put it more bluntly, saying there was not "a snowball's chance in hell" that the two countries would become one.

Canadian Prime Minister Justin Trudeau has hit back at Donald Trump's threat to use "economic force" to absorb Canada into the US saying there isn't "a snowball's chance in hell" to join the two.

“You don’t have a snowball’s chance in hell of getting it through the House, because we took the border issue and we didn’t address it the way it should have been,” Mr. Graham said.

Nikki Haley may not have a snowball's chance in hell of winning the Republican presidential nomination but she's decided she's not going to go quietly.

It's true that Trump's brain is addled by over-consumption of cable news, so there is a thin possibility that he's caught up in the hype falsely implying she has a snowball's chance of winning the primary.