The US has launched a new investigation into some of its biggest trading partners after the Supreme Court struck down a key part of President Donald Trump's tariffs policies last month, BBC reported. 

On Wednesday, US Trade Representative Jamieson Greer said the Section 301 unfair trade practices probe could lead to new tariffs against countries including China, the European Union, India, Japan, South Korea and Mexico by this summer.

The probe could allow the US to impose tariffs on goods from any of the countries found to have engaged in unfair trade practices, according to BBC.