So I'm upvoting you but please consider my reply here:

1. I agree that trade is a great place to hit the US. As a Canadian we have been actively boycotting in my household since the threats against us a year ago. I would love a global coordinated effort to move off US social media (like we're doing here), boycott products and digital services, and encourage lawmakers in other countries to repeal laws around digital restrictions they were coerced into enacting.
2. Threatening ANY country let alone an ally and then having no real domestic repercussions blows my mind and shows their true colors as a country. They have branches of government that could stop this in its tracks but have so far stayed mostly silent.
3. I'll keep repeating this despite the emotional downvotes by some, but there are better options at this stage than selling off any significant amount (dumping) of US Treasuries in quantities large enough that it would make them care. So many other allied countries we do like will have economic repercussions and it's also hard to predict where once dumping starts how far it could go. Even in "small amounts" if it causes other governments to start panic selling (to not be a country left with useless devalued Treasury bonds) it's a global economic disaster. That's why I call this the nuclear option, because it comes with fallout, not because I think Trump's actions are reasonable or sane.