You do realize that this current USA administration did not consult any of it's allies, nor the EU, nor NATO, nor the UN, before they started this war.
There were no negotiations, nor plans to involve other countries. He went as far as to say the EU and NATO were too weak and didn't need them.
Only after Trump realized that Iran was going to resist and not fold immediately, did he start saying that the EU, China and Arab countries have to help out cleaning out his mess.
But the worst part is that Trump is so unrealiable, that most countries don't want to get involved because there is a good chance he will just abandon everyone as soon as they enter the fray. Just like he did with Ukraine.
Now compare to what the USA did, during the first Bush administration when Iraq was the biggest threat in the region.
After the Iraq invasion of Kuwait, the USA consulted with it's allies and with the UN. And because of that, got the approval of everyone, including other Arab countries and even Russia.
On top of that, the USA managed to get a coalition of 30 countries to help out with the war against Iraq.
This is an example of just how a competent USA administration, also from the Republican party, managed to get everyone to side with it. A stark contrast to the sheer incompetence of the Trump administration in dealing with it's allies and the rest of the world.