The White House says US President Donald Trump will likely hold talks with Chinese leader Xi Jinping this week, following similar comments by top US officials over the weekend. This comes as tensions are ratcheting up again between the two countries, with both sides accusing the other of violating a trade truce deal agreed in Geneva last month. Meanwhile, the European Union is threatening countermeasures after Trump moved to double US tariffs on steel and aluminium imports to 50 percent starting on June 4.