Answer:
1. The president would need a memo back ASAP.
Memo
2. The first thing I recommend is to contact The UN. As well as mobilizing troops in order to aid Mexico as they are an ally and have been a trade partner for years. I wouldn't recommend contacting red cross as they're a relief for when natural disasters strike.
3. The international organization you could contact would be The United Nations.
I'd contact NATO as mexico is an essential ally in trade for the United States and without Mexico our economy is at risk.
Explanation: