TEHRAN (Tasnim) US President Donald Trump reignited his trade war by threatening more than a dozen countries with higher tariffs Monday but then said he may be flexible on his new August deadline to reach deals.

Trump sent letters to trading partners including key US allies Japan and South Korea, announcing that duties he had suspended in April would snap back even more steeply in three weeks, AFP reported.

Tokyo and Seoul would be hit with 25 percent tariffs on their goods, he wrote. Countries including Indonesia, Bangladesh, Thailand, South Africa and Malaysia were slapped with duties ranging from 25 percent to 40 percent.

But in a move that will cause fresh uncertainty in a global economy already unsettled by his tariffs, the 79-year-old once again left the countries room to negotiate a deal.

I would say firm, but not 100 percent firm, Trump told reporters at a dinner with visiting Israeli regime prime minister Benjamin Netanyahu when asked if August 1 deadline was firm.

Pressed on whether the letters were his final offer, Trump replied: I would say final but if they call with a different offer, and I like it, then well do it.

The US president had unveiled sweeping tariffs on imports on what he called Liberation Day on April 2, including a baseline 10 percent tariff on all countries.

But he quickly suspended all tariffs above 10 percent for 90 days following turmoil in the markets.

They were due to kick back in on Wednesday and Trump sent the letters in advance of that deadline.

Trumps near-identically worded letters to Japanese and South Korean leaders said he would impose 25 percent tariffs as their trading relationships with Washington were unfortunately, far from Reciprocal.

He warned of further escalation if there was retaliation against the levies.

But Trump on Monday also signed an order formally extending the Wednesday deadline, postponing it to August 1.

The new August date effectively marks a further delay and Trumps latest comments threaten to compound the uncertainty over when the deadline really is.

According to letters posted to Trumps Truth Social platform, products from Indonesia will face a 32 percent tariff, while the level for Bangladesh is 35 percent and Thailand, 36 percent.

Most countries receiving letters so far had duties similar or unchanged from rates threatened in April, although some like Laos and Cambodia saw notably lower levels.

The Trump administration is under pressure to show results after promising 90 deals in 90 days.

So far only two firm deals have emerged, with Britain and Vietnam, plus an agreement to dial back super-high tit-for-tat tariffs with China.

Japans Prime Minister Shigeru Ishiba said at a cabinet meeting Monday that the announcement of the 25 percent tariffs is genuinely regrettable, local media reported.

South Koreas National Security Adviser Wi Sung-lac meanwhile met with his US counterpart Marco Rubio in Washington, expressing hope that a bilateral summit could soon be held to achieve mutually beneficial outcomes across key pending issues.

Asked why Trump opted to start with Japan and South Korea, White House Press Secretary Karoline Leavitt said: Its the presidents prerogative, and those are the countries he chose.

Thailands acting Prime Minister Phumtham Wechayachai said Tuesday he wanted a better deal than the 36 percent tariff Trump threatened to impose, adding: The most important thing is that we maintain good relations with the US.

Malaysia said it was committed to continuing engagement with the US toward a balanced, mutually beneficial, and comprehensive trade agreement, its trade ministry said in a statement, after Washington imposed a 25 percent tariff on the Southeast Asian nation.

US Treasury Secretary Scott Bessent said Monday that there would be more deals coming up: We are going to have several announcements in the next 48 hours.

Trump has also threatened an extra 10 percent tariff on countries aligning themselves with the emerging BRICS nations, accusing them of Anti-American policies after they slammed his duties at a summit.

But partners are still rushing to avert Trumps tariffs altogether.

The European Commission said EU chief Ursula von der Leyen had a good exchange with Trump on trade when the pair spoke Sunday.