Donald Trump differs with other world leaders over Russia and trade at the talks in Canada.Read more
General Agreement on Tariffs and Trade
UK said it was deeply disappointed by a US decision to move ahead with tariffs on aluminum and steel imports from Canada, Mexico and the European Union.
"We are deeply disappointed that the US has decided to apply tariffs to steel and aluminium imports from the EU on national security grounds," a government spokesman said.
"The UK and other European Union countries are close allies of the U.S. and should be permanently and fully exempted from the American measures on steel and aluminium."
President Trump's tariffs on steel imports will be coming into force soon - what harm could they do?
As President Trump introduces tariffs on steel and aluminium imports to the US, the BBC's Kim Gittleson takes a closer look at the implications.
Donald Trump is introducing new tariffs on imports of steel and aluminium into the US.
The US president pokes fun at Gary Cohn during his economic adviser's last cabinet meeting.
At a White House event the US president joked with steelworkers - and challenged one to arm wrestle.
The European Commission (EC) has a draft list of goods to tax should US President Trump go ahead and tax European steel and aluminium imports.