White House urges 'cooler heads to prevail' as EU fires back on Trump tariffs over Greenland

National Economic Council Director Kevin Hassett urged "cooler heads to prevail" Sunday as European leaders blasted President Donald Trump’s tariff threats aimed at forcing a Greenland purchase deal.

"When you are engaged in negotiation with any country and with President Trump, you'll see both sides take very strong extreme positions, but, in the end, the president is the person who wrote ‘The Art of the Deal’ because he's so good at deal-making," Hassett told Fox News' Jacqui Heinrich.