The policy of every American president since Harry S. Truman has been to limit the proliferation of nuclear weapons.
They have not always been successful. The world’s most powerful weapons spread, with nine countries now possessing them. But no United States president has actively sought their further proliferation, as the belligerent policies of Donald Trump are now set to do.
In 2018, during his first term as president, Trump tore up the Iran nuclear deal, which had successfully placed limits on the enrichment of weapons-grade materials in exchange for sanctions relief.
