White House asked trump whether he had a message to Iran, Trump said he had no message, but Iran "playing with fire."
The White House said Trump had spoken to French President Emmanuel Macaron about Iran overflowing its stockpile of enriched uranium beyond the nuclear deal.
The United States will never allow Iran to develop nuclear weapons after Tehran said it had exceeded its stockpile of enriched uranium set out in the nuclear deal in 2015, the White House said on Monday.
"The maximum pressure on the Iranian regime will continue until its leaders change course," White House spokeswoman Stephanie Gresham said. "The United States and its allies will never allow Iran to develop nuclear weapons."
"It was wrong, in the Iranian nuclear agreement, to allow Iran to enrich uranium at any level," the statement said.
"We have to re-impose the old rules of nonproliferation, which prevent Iran from enriching uranium," he said.
The White House reiterated its willingness to continue its campaign of "maximum pressure" on Tehran, "as long as its leaders do not change the way they work."
"The (Iranian) regime must put an end to its nuclear ambitions and harmful behavior," the statement added.
Iran said on Monday it had exceeded its stockpile under the 2015 nuclear deal, in its first announcement of a breach of its obligations under the agreement.
The relationship between Tehran and Washington reached a dangerous level of tension with Iran on June 20 to shoot down a US drone. While Iran confirms that the plane was in Iranian airspace, the United States denied.
In response to US President Donald Trump's unilateral withdrawal from the nuclear deal in May 2018 and the re-imposition of sanctions on Iran, Tehran announced on May 8 that it was no longer bound by the agreement, with 130 tons of heavy water, of low enriched uranium 300 kg.
Tehran is also threatening to increase its uranium enrichment rate to 3.67 percent higher than July 7 and restart its project to build the Arak heavy water reactor in the center of the country if it is not assisted by other signatories. Germany, China, France, Britain, Russia) to circumvent US sanctions.