President Trump has sent highly unusual, Sharpie-written notes to Canadian Prime Minister Justin Trudeau at least twice, Axios has learned.

One missive was so odd, the Canadian ambassador double-checked with the White House to be sure it wasn’t a prank. In at least one instance, Trudeau also wrote to Trump. The exchange of handwritten notes, never before reported, was confirmed by several sources with firsthand knowledge.

The diplomatic missives include:

A torn-out Bloomberg Businessweek cover featuring a portrait of Justin Trudeau.

A back-and-forth about U.S.-Canada trade figures that culminated in Trudeau sending Trump a printout of the website of the Office of the United States Trade Representative with a smiley face beside the U.S. government figure showing America has a trade surplus with Canada (contrary to Trump’s claims).