Reuters/Francois Lenoir
President Donald Trump at a meeting of the North Atlantic Council during a NATO summit in Brussels, Belgium.
In two years as president, President Donald Trump hasn't hesitated to speak out when he thinks he's getting a bad deal.
NATO has been a frequent target of those attacks, which often revolve around Trump's belief that alliance members' lack of
It's not new for a US president to push NATO members to spend more on defense, but the harshness and frequency of Trump's attacks are without precedent for an American president.
These attacks were, in part, what led Defense Secretary Jim Mattis to resign in protest, saying that the president was undermining alliances that were crucial to American superpower.
"My views on treating allies with respect and also being clear-eyed about both malign actors and strategic competitors are strongly held," Mattis wrote in the stinging rebuke delivered Thursday.
Here are 8 times that Trump took aim at the US's transatlantic partners.