President Donald Trump has taken to Twitter to write an all-caps declaration stating that Iran would never be allowed to gain access to a nuclear weapon.

Trump did not immediately expand on what he meant by the statement.

The president made the comments after Iran’s announcement Sunday that it would continue to reduce its obligations under the Joint Comprehensive Plan of Action nuclear deal, and proceed to enrich uranium based on the technical requirements of its nuclear industry. Iran also emphasised that it would continue to cooperate with the International Atomic Energy Agency, and voiced its readiness to return to its obligations under the JCPOA if sanctions against the country were lifted.

Iranian officials have also repeatedly said that they have no intention of pursuing nuclear weapons, or weapons of mass destruction of any kind, since these are said to run counter to the country’s Islamic faith. Iran destroyed its stockpile of chemical weapons by 1997 as it ratified the Chemical Weapons Convention, and has repeatedly urged the US to do the same.

Tensions between Iran and the US have escalated over the past two weeks amid violence in Iraq, beginning with a rocket attack on a US base in Kirkuk and culminating in the US assassination of Iranian Revolutionary Guard Corps Quds Force Commander Maj. Gen. Qasem Soleimani in Baghdad on Friday.