China is the world's supplier of these two metals. EU, Canada, and others are now only blips on the radar. That ship already sailed, and the last administration invested in China instead doing their job. But it goes back further. Greedy American corps have lobbied against US interests and for Chinese interests for 30+ years now and Washington DC is easy to purchase.
And guess what? EU and Canada will lose their ability to produce these metals as well. China isn't just dominating the US, it's dominating the world. What China's cheap coal power produces, the EU and Canada cannot fight. Even if they could, China can lower the price to below cost. It's one of the perks of having an aggressive, well armed, totalitarian government. You can subsidize the destruction of competition.
The EU has proven time and time again, that they are willing to allow China to dominate them. And Canada is no better. China tells them to jump, and they ask "how high master!"
Canada would not be worried about US trade negotiations much if China wasn't already crapping all over them. But ... Canada wants China to dominate them or at least is not able to stop their politicians from selling the citizens out. If Canada can't sell aluminum, it's because they lost the market to the Chinese. Don't blame the US for that.
Before Canadians get too high an mighty about themselves, read up on how you've treated the Native Canadians. Full rights in 1982? Are you freakin' serious? Talk about Nationalist White Supremacists running the State, wow. The US is terrible in how we treat our original inhabitants, but they were given full rights 95 years ago, not in the Disco Era.
So 'nationalism' in Canada is insanely high, way past any form of decency. And they want to criticize the US for having nationalist tendencies. "You're not my pal, friend".