You're delegating powers to the President that would normally require an act of congress. The sanctions against Iran are a relatively tame example, there's 46 other national emergencies that give the President far more power.

Here's some good reading:

https://www.politico.com/news/2021/07/27/democrats-biden-som...

They successfully argued the President can just attack other countries whenever he wants, so long as it's part of fighting "terrorism".