The 16-year-old Swedish climate change activist sets sail for the U.S. on board a zero-emissions yacht on Wednesday.
"Perhaps actually saying & doing it out loud would have a bigger impact," suggested the MSNBC host.
It didn't go according to plan.
"We never learn!" the president tweeted in response to high-profile figures, including Fox News' Sean Hannity, backing Cuomo after a man called him "Fredo."