The exemption of smartphones, laptops and other electronic products from import tariffs on China will be short-lived, top US officials have said, with Donald Trump warning that no one was “getting off the hook.”

“There was no Tariff ‘exception’, Trump said in a social media post on Sunday. “These products are subject to the existing 20% Fentanyl Tariffs, and they are just moving to a different Tariff ‘bucket.’”

In the post on his Truth Social platform, Trump promised to launch a national security trade investigation into the semiconductor sector and the “whole electronics supply chain”.