Trump's latest salvos came as ministers from Organisation for Economic Cooperation and Development (OECD) countries gathered in Paris to discuss the world economy's outlook in light of the trade war.

The US leader's sweeping duties on allies and adversaries have strained ties with trading partners and sparked a flurry of negotiations.

The White House has suggested Trump will speak to Chinese President Xi Jinping this week, raising hopes they can soothe tensions and speed up a trade deal between the world's two biggest economies.

But early Wednesday, Trump appeared to dampen hopes for a quick resolution.

"I like President XI of China, always have, and always will, but he is VERY TOUGH, AND EXTREMELY HARD TO MAKE A DEAL WITH!!!" he posted on his Truth Social platform.

Asked about the remarks, Chinese foreign ministry spokesman Lin Jian said Beijing's "principles and stance on developing Sino-US relations are consistent."

China was the biggest target of Trump's April tariff blitz, hit with additional levies of 145 percent on its goods as both sides engaged in tit-for-tat escalation. China's countermeasures on US goods reached 125 percent.

Both sides agreed to temporarily lower rates in May, while Trump delayed most sweeping measures on other countries until July 9.

- US neighbors incensed -

Trump's remarks came hours after he increased tariffs on aluminum and steel imports from 25 percent to 50 percent on Wednesday, raising pressure on key trading partners, while exempting Britain from the higher levy for now.

The move drew sharp rebukes from immediate neighbors Canada and Mexico, with Mexican President Claudia Sheinbaum vowing countermeasures if Trump did not grant tariff relief.

Mexico will request an exemption from the higher metals tariff, Economy Minister Marcelo Ebrard said.

Canada's Prime Minister Mark Carney blasted the levies as unjustified and illegal, adding that his country would respond.

Trump's tariffs have fanned worries among Canada's workers. Ron Wells, president of United Steelworkers Local 1005 expressed concern that Canadian steel company Stelco could see significant parts of its orders dry up, impacting staff.

The union's members who work at the company want to see the tariffs situation resolved, he told AFP.

"People are just pissed off that (Trump) keeps changing his mind and he's playing chicken with the economy," Wells said.

Tensions could surge further in the coming weeks, with US Commerce Secretary Howard Lutnick opening the door Wednesday to potential tariffs on imported commercial aircraft and parts.

Lutnick said Washington is expecting an investigation update on such imports and will soon "set the standard for aircraft part tariffs."

While some of Trump's most sweeping levies face legal challenges, they have been allowed to remain in place as an appeals process takes place.

- US-EU talks 'advancing' -

The United States and European Union struck a more conciliatory note after talks on the sidelines of the OECD gathering.

US Trade Representative Jamieson Greer said after talks with EU counterpart Maros Sefcovic that negotiations were "advancing quickly."

Greer added that the meeting was "very constructive and indicates a willingness by the EU to work with us to find a concrete way forward to achieve reciprocal trade."

EU goods will be hit with 50-percent tariffs on July 9 unless the 27-nation bloc reaches a deal with Washington. The EU has vowed to retaliate.

Sefcovic said the doubling of metal tariffs "doesn't help the negotiations" but both sides were nonetheless "making progress."

The US-EU meeting took place a day after the OECD cut its forecast for global economic growth, blaming Trump's tariffs for the downgrade.

A report by the nonpartisan Congressional Budget Office in Washington found Wednesday that Trump's tariffs would reduce the size of the US economy and fuel inflation, while lowering federal deficits.

After talks Tuesday between UK Trade Secretary Jonathan Reynolds and Greer, London said US tariffs on metal imports from Britain remain at 25 percent for now. Both sides need to work out duties and quotas in line with the terms of a recently signed trade pact.

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