Iran does not trust the United States as a negotiating partner, the interior minister in Tehran said on Tuesday, a day after President Donald Trump offered to meet his Iranian counterpart for talks without preconditions.

"The United States is not trustworthy. How can we trust this country when it withdraws unilaterally from the nuclear deal?" Abdolreza Rahmani Fazli was quoted as saying by the semi-official Fars news agency.

Iranian officials reacted skeptically earlier on Tuesday to Trump's comments that he's willing to negotiate with his Iranian counterpart, saying instead that if Trump wants talks, he needs to rejoin the international nuclear deal he unilaterally pulled out of earlier this year.

Trump on Monday said he'd meet with Iranian President Hassan Rouhani "anytime" if the Iranian leader were willing.

In his first public remarks after the comment, Rouhani did not mention Trump at all but instead stressed the need for the other nations involved in the nuclear deal to forge ahead with their pledges of trying to salvage it.

"Today we are at a very critical point in history regarding the nuclear deal, and Europe's transparent measures to compensate for the United States' unlawful withdrawal from it are very important for the Iranian nation," Rouhani said after talks with new British Ambassador Rob Macaire.

In addition to Britain, China, Germany, France, Russia and the European Union are negotiating with Iran on preserving the deal.

The Iranian leadership has previously ruled out one-on-one talks with Trump, following his decision to pull the United States out of the deal under which Iran was given relief from sanctions in return for curbs on its nuclear program.

Iran's semi-official ISNA news agency quoted political adviser Hamid Aboutalebi as saying that for talks to happen, the U.S. needs to rejoin the deal.

"Those who believe in dialogue as a method of resolving disputes in civilized societies should be committed to the means," he said.

Trump withdrew from the landmark nuclear accord in May, saying it was too generous to Iran. He has vowed to ramp up sanctions until Iran radically changes its regional policies, including its support for regional militant groups, something the country's leaders have long refused to do.

Even though Trump on Monday said if Rouhani were to meet with him there would be "no preconditions," he also did not walk back from any of those earlier demands.

With the first U.S. sanctions due to come into effect next Monday, the economy in Iran has already been hit, giving rise to growing fears of prolonged economic suffering. Another round, covering other types of commerce, including oil purchases, goes into effect Nov. 4.

Rouhani on Tuesday again suggested Iran could cause major disruptions in the Gulf region by attempting to block key shipping lanes, saying "Iran has never sought tensions in the region and does not want there to be any problem for the world's waterways, but it will never let go of its right to export oil," the semi-official Mehr news agency reported.

With the U.S. sanctions looming, the Iranian currency has been in freefall, hitting a new low Monday, at 122,000 rial to the dollar on the thriving black market. It recovered slightly to 115,000 to the dollar on Tuesday, and concerns are growing as Iranians have seen their savings dwindle and purchasing power drop.

Heshmatollah Falahatpisheh, the head of influential parliamentary committee on national security and foreign policy, suggested a U.S. return to the nuclear deal, which would bring an end to the economic uncertainty, would be needed before Tehran could think of negotiating.

"There can be no negotiations with the Americans raising the issue of talks from the position of power," he was quoted as saying on the website of the Iranian parliament, calling Trump's decision to pull out of the nuclear deal the "biggest blow to diplomacy."

Reformist lawmaker Mostafa Kavakebian questioned negotiating with Trump, calling him "untrustworthy," and also said now was not the time for talks.

"If this negotiation (is) carried out in any form, then it will be considered as surrender and the Iranian nation will not surrender," he said.