President Donald Trump and Canadian Prime Minister Justin Trudeau had a testy phone call on May 25 over new tariffs imposed by the Trump administration targeting steel and aluminum imports coming from Canada, including one moment during the conversation in which Trump made an erroneous historical reference, sources familiar with the discussion told CNN.

According to the sources, Trudeau pressed Trump on how he could justify the tariffs as a “national security” issue. In response, Trump quipped to Trudeau, “Didn’t you guys burn down the White House?” referring to the War of 1812.