Four Republicans defy president by supporting measure to block tariffs on Canada as world leaders react to sweeping tariffs

• Trump announces sweeping new trade tariffs

The World Trade Organization chief told member states on Thursday that it had received “many” questions about the impact of US president Donald Trump’s tariffs on trade and would respond to their questions, according to a letter.

“Many of you have been in touch about the US announcement on tariffs, asking for the Secretariat to provide an economic analysis of the impact of these tariffs and any potential reaction on your trade,” director-general Ngozi Okonjo-Iweala wrote in a letter to ambassadors dated 3 April and seen by Reuters.