Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations--United States.
International relations
Political development.
Trump, Donald, 1946-
United States--Foreign relations--Europe.
United States--Politics and government--21st century.
Princeton subject headings:
Conservatism--United States--History--21st century.
European Union countries--Foreign relations--United States.
Populism--United States.
Trump, Donald, 1946-
United States--Foreign relations--European Union countries.