TEHRAN, Iran — Iran's president on Tuesday warned the country could face "some problems" ahead of President Donald Trump's decision on whether to pull out of its nuclear deal with world powers.

Without directly naming Trump, Hassan Rouhani's remarks at a petroleum conference in Tehran represented the first official Iranian comment on the U.S. president's overnight tweet that he'd make an announcement on the deal Tuesday.

"It is possible that we will face some problems for two or three months, but we will pass through this," Rouhani said.

Rouhani also stressed Iran wants to keep "working with the world and constructive engagement with the world." That appeared to be a nod to Europe, which has struck a series of business deals with Iran since the landmark 2015 nuclear deal.

Iran likely hopes the European Union will pass laws to protect European firms from any potential U.S. sanctions.

Trump's tweet came late on Monday night, meaning major newspapers across Iran missed the announcement for their front pages.

Iran's state-run television broadcaster carried the announcement at 10 a.m. local time, and Iran's state-run IRNA news agency also carried a report on it.

Overnight, Iran's semi-official news agencies carried the news off Trump's tweet, while others shared foreign media reports online.

Trump's announcement, set for the 2 p.m. EST at the White House, will come after nightfall in Iran.

Iran's 2015 nuclear deal imposed restrictions on the Islamic Republic's nuclear program in return for the lifting of most of the U.S. and international sanctions against Tehran.

However, the deal came with time limits and did not address Iran's ballistic missile program or its regional policies. Trump has repeatedly pointed at that, while referring to the accord as the "worst deal ever." However, proponents of the deal have said those time limits were to encourage more discussion with Iran in the future that could grow into addressing those other concerns.

Rouhani, shown smiling and addressing an audience at a table at the expo Tuesday, sought to show calm to Iranians. Meanwhile, Iran's parliament speaker Ali Larijani reportedly said Trump pulling out of the deal would increase unity among Iranians. Iran's Central Bank chief Valiollah Seif also tried to calm nerves, telling state television that the U.S. decisions "does not create a problem" for Iran's economy.

However, many in Tehran and elsewhere in the country are worried about what Trump's decision could mean for the country.

Already, the Iranian rial is trading on the black market at 66,000 to the dollar, despite the government-set rate being at 42,000 to $1. Many say they have not seen the benefits of the nuclear deal.

Iran's poor economy and unemployment already sparked nationwide protests in December and January that saw at least 25 people killed and, reportedly, nearly 5,000 arrested.

Associated Press writer Jon Gambrell in Dubai, United Arab Emirates, contributed to this report.