UK jobs face being "crushed" by "nakedly political" trade sanctions against Bombardier's new airliner, large parts of which are built in Northern Ireland, according to unions.
The claim came from union Unite after the America's Commerce Department confirmed 292pc tariffs would be imposed on Bombardier's C-Series imported for sale to US airlines.
The duties came after Boeing said Canadian company Bombardier was selling 75 of its C-Series airliners to US carrier Delta at "absurdly low" prices, and was only able to do so because of illegal state support in Canada and the UK, according to the Daily Telegraph.
Boeing called for action from US authorities saying the C-Series competes with its small 737 jet, a point refuted by Bombardier.
Steve Turner, Unite assistant general-secretary, said: "The US Commerce Department decision on C-Series tariffs is nakedly political and has the potential to crush jobs, not only in Northern Ireland but in the US too.