>No approval from Congress.

To be fair that's been the case for decades. Trump's hardly new in this.

Needs to notify Congress within 48 hours (and he did beforehand), and has 60 days before needing Congress to declare war.

Looking at the list of countries we have declared war on

https://www.senate.gov/about/powers-procedures/declarations-...

I don't think it matters.

For better or for worse, the War Powers Resolution acts as standing approval.