TL;DR: Trump said Trudeau stabbed him in the back, Trudeau denied it, we got nowhere
Leaders of seven of the world's most powerful economies met up this weekend, and it almost went really well.
What it means: We've been talking lots about this whole tariff story – Trump wanting to add taxes onto goods from the EU, Canada, and Mexico, in an attempt to protect American industry and stop spending money on other countries' products.
This meeting of the 'G7' (that's the US, the UK, Germany, Italy, France, Japan, and Canada)was supposed to be a chance to iron out all the bad feeling that'd come out of those announcements. It almost was: the leaders came up with a plan for 'fair, free, mutually beneficial trade' that they nearly signed.
At the lat minute, Trump said he wouldn't sign it because Justin Trudeau, PM of Canada, had 'stabbed him in the back' with his threat of putting tariffs on American goods to get back at him for putting tariffs on Canadian ones. Trudeau says he'd always been open about that plan: tariffs are going to kick in from July 1, he said.