The EU's foreign policy chief Federica Mogherini added that the global community must also be united in preserving the deal, which she said helped make the world a safer place and prevent a nuclear arms race in the region.
He also wanted to extend legislation to make explicit that testing of long-range missiles was "inseparable" from the nuclear weapons programme, so Iran's ballistics testing should also "be subject to severe sanctions".
"The Islamic Republic of Iran stresses clearly that it will not take any measures beyond its commitment to the [2015 deal], nor will it accept changes to this agreement now or any time in the future".
But he says this waiver will be the last and is meant to secure an agreement from European allies to fix what he says are flaws in the pact.
Trump said:"This is a last chance".
Iran's foreign minister, Mohammad Javad Zarif, wrote Saturday on Twitter that the nuclear agreement between Iran, the United States and other world powers was "a solid multilateral agreement" that Trump was "maliciously violating".
Iran says the U.S. has "crossed a red line" by imposing sanctions on the head of its judiciary, Ayatollah Sadeq Amoli-Larijani, BBC reported. It prevents Iran from developing nuclear weapons while offering sanctions relief to allow the Islamic Republic to participate in worldwide commerce and banking.
"I have been very clear about my opinion of that deal", he said in his January 12 statement.
Iran says its nuclear program has only peaceful aims and says it will stick to the accord as long as others respect it.
University Of Rochester President Resigns After Sexual Harassment Accusations
But it did recommended that UR clarify and expand its procedures for dealing with sexual harassment by faculty members. Yet, she said, her firm's conclusions are legal, not "moral" ones.
Trump had come under heavy pressure from European allies to issue the sanctions waiver.
After the President's announcement on Friday, Obama officials who helped negotiate the 2015 agreement reiterated that the accord ensures Iran can not obtain a nuclear weapon.
He said Iran must allow "immediate inspections at all sites requested by global inspectors" and that provisions preventing Iran from possessing a nuclear weapon must not expire.
He also called on Iran to stay calm and continue to fulfill obligations under the deal.
U.S. regulations require the president to endorse JCPOA every 90 days and extend waivers of economic sanctions against Iran every 120 days.
"The Iran deal in its current form is unacceptable and is simply not working", Mr. Gardiner said.
In October, he refused to recertify for Congress that Iran was complying, accusing it of "not living up to the spirit" of the agreement.