Isolationist (noun)

A person who advocates or practices isolationism.

Origin:

From the noun isolation + -ist.

Examples:

1. The President is often criticized by the opposition for being an isolationist.
2. Isolationists believe that a country should avoid involvement in international affairs.
3. Many isolationists argue that the US should pull back from its overseas commitments and focus on domestic issues.
4. The isolationist's stance on foreign policy is often seen as controversial.
5. The isolationist movement gained popularity during the interwar period in the United States.