President Trump used his State of the Union address Tuesday night to warn that Iran has built missiles capable of striking American bases in Europe and the Middle East and is pursuing weapons that could eventually reach the United States, while also confirming that diplomatic talks with Tehran remain underway.

Speaking before a joint session of Congress, Trump sharply criticized Iran’s leadership and outlined what he described as escalating threats from the regime. “This is some terrible people,” Trump told lawmakers in reference to the Tehran regime, which rejected what it called “big lies” from the president. “They’ve already developed missiles that can threaten Europe and our bases overseas, and they’re working to build missiles that will soon reach the United States of America.”

The president said that even after U.S. forces carried out airstrikes in June on three significant Iranian nuclear facilities, Tehran continues to push forward with its atomic ambitions. According to Trump, the Islamic Republic is attempting to restart its nuclear program “all over … and are, at this moment, again pursuing their sinister ambitions.

“We are in negotiations with them,” Trump went on. “They want to make a deal but we haven’t heard those sacred words: ‘We will never have a nuclear weapon.’”

Another round of negotiations between U.S. and Iranian officials is scheduled for Thursday in Geneva, Switzerland. Trump’s special envoy, Steve Witkoff, who is leading the American delegation, drew attention last month when he told Fox News that Iran was “probably a week away from having industrial-grade bomb-making material.”

During his address, Trump also cited reports alleging that Iranian authorities killed 32,000 people during a violent crackdown on nationwide protests that erupted in December and January over the country’s struggling economy.

That number has circulated widely on social media but has not been echoed by major Western governments or international human rights organizations.

The Human Rights Activists News Agency, which gathers information through contacts inside Iran, reported Monday that slightly fewer than 6,500 demonstrators had been killed, with an additional 11,744 cases “under review.”

Referring to the unrest, Trump said: “Just over the last couple of months with the protests, they’ve killed at least, it looks like 32,000 protesters, 32,000 protesters in their own country,” the president said Tuesday night. “They shot them and hung them. We stopped them from hanging a lot of them with the threat of serious violence.”

Iran swiftly rejected the president’s claims. Esmail Baghaei, a spokesman for the country’s foreign ministry, characterized Trump’s comments as part of a “disinformation and misinformation campaign” Wednesday, saying: “Whatever [the US is] alleging in regards to Iran’s nuclear program, Iran’s ballistic missiles, and the number of casualties during January’s unrest is simply the repetition of big lies.”

Ahead of the speech, Secretary of State Marco Rubio and CIA Director John Ratcliffe met with congressional leaders at the White House to discuss possible military options involving Iran.

Following that briefing, lawmakers from both parties expressed unease about the prospect of renewed conflict in the region. “This is serious, and the administration has to make its case to the American people,” Senate Minority Leader Chuck Schumer (D-NY) told reporters following the briefing, without elaborating on its contents.

“I’m very concerned,” added House Intelligence Committee vice chairman Jim Himes (D-Conn.). “Wars in the Middle East don’t go well for presidents, for the country, and we have not heard articulated a single good reason for why now is the moment to launch yet another war in the Middle East.”

Earlier this year, on Jan. 2, Trump warned that Iran would face bombing if it executed anti-government demonstrators. A planned strike was later put on hold after Tehran said it would cancel 800 scheduled executions, and subsequent discussions between the two sides have centered on Iran’s nuclear activities.

Meanwhile, Trump has directed two U.S. aircraft carrier strike groups to move into the region, positioning them in case military action becomes necessary.

Although the president has voiced support for regime change in Iran, it remains uncertain whether any potential American military operation would be designed to remove the country’s leadership, either by targeting senior officials or by weakening the government to pave the way for its collapse.

Earlier this week, the White House pushed back on reports claiming that Gen. Dan Caine, chairman of the Joint Chiefs of Staff, had cautioned Trump about the dangers of becoming entangled in a prolonged conflict in the Middle East.