He cited his "very good relationship" with North Korea's leader Kim Jong Un, but he also accused South Korea of failing to help the US in its war with Iran – comments that suggest major new cracks in the US’s relationship with a key ally.
To understand the reaction from South Korea, Asma Khalid from The Global Story podcast speaks to the BBC’s Seoul Correspondent Jake Kwon about whether Trump’s sidelining of South Korea is a major foreign policy shift for the US.
