Iran's Supreme leader criticizes 'bullying' countries in response to Donald Trump's letter demanding negotiations on Iran's nuclear program. Trump had warned Tehran of potential military action if it did not agree to talks. Ayatollah Ali Khamenei stated that Iran would not negotiate with 'bullying governments' insisting on negotiations. Iran has rapidly advanced its nuclear program in recent years. Trump has expressed a desire to strike a new deal with Iran to prevent further development of its nuclear program.