Executive agreement between presidents and heads of foreign countries are considered .
A. Legal
B. illegal
C. Unconstitutional
D. Treaties

D. Treaties

Explanation:

Treaty, a binding formal agreement, contract, or other written instrument that establishes obligations between two or more subjects of international law (primarily states and international organizations).

The Treaty of Paris is an example of a peace agreement. This treaty ended the Revolutionary War. ... More recently, the North American Free Trade Agreement, or NAFTA, is a treaty between the United States, Canada and Mexico.

Modern treaties are nation-to-nation relationships between Indigenous peoples, the federal and provincial Crown and in some cases, a territory. ... Also known as comprehensive land claim agreements, modern treaties are generally signed where Indigenous title and rights have not been settled.