Tensions flair up as Trump Warns Iran: ‘Radicalised People Can’t Have Nuclear Weapons’ Amid Renewed Nuclear Talks. He vowed harsh consequences if the Islamic Republic does not abandon what he calls "the concept of a nuclear weapon." Trump’s warning comes after the first round of indirect nuclear talks in Oman on April 12 between US and Iranian officials, the first dialogue since Trump’s return to the presidency. Both sides call the talks "positive" and "constructive," while Trump made it clear that he expects swift progress—or else.