PressTV--  "Unilaterally putting the deal at risk does not isolate Iran," Biden said in a statement posted on Facebook. "It isolates us."

"This decision will cost us leverage. It will weaken our unity with our allies. It will damage our credibility," Biden said in the extensive post.

Defense Secretary James Mattis said at a Senate Armed Forces committee hearing this month that remaining in the Iran nuclear deal is in the best interest of US national security, something Biden cited in his post.

Trump said Friday that he has refused to recertify the nuclear agreement and warned he might ultimately terminate it, in defiance of other world powers and undermining a landmark victory of multilateral diplomacy.

Trump’s speech signaled a major shift in US policy and detailed a more confrontational stance toward Iran over its civilian nuclear and ballistic missile programs.

Speaking from the White House, Trump said he will choose not to certify that Tehran is complying with the 2015 nuclear agreement known as the Joint Comprehensive Plan of Action (JCPOA).

The International Atomic Energy Agency (IAEA) has recently reported that Iran is complying with the agreement.

Trump is required by a 2015 law known as the Iran Nuclear Agreement Review Act (INARA) to certify every 90 days whether or not Iran is complying with the nuclear deal. He has certified the deal twice since coming to office.

If he argues that Iran is not in compliance, that could cause an American withdrawal from the international pact.

While Trump did not pull Washington out of the nuclear deal, he gave the US Congress 60 days to decide whether to reimpose economic sanctions against Tehran that were lifted under the pact.

Reimposing sanctions would put the US at odds with other signatories of the accord such as the UK, France, China, Russia and Germany, as well as the European Union.

Iran’s Foreign Ministry said earlier on Friday that Tehran has a “very broad” range of options for any breach of the JCPOA and would “end all its commitments in this regard if deemed necessary.”

Iranian President Hassan Rouhani said Trump’s speech against the Islamic Republic was nothing more than insults and delirious talk.