US President Donald Trump said on Friday that a change of government in Iran would be the "best thing that could happen." This is his clearest call yet for overthrowing Iran’s clerical rulers. Trump made these remarks while sending a second US aircraft carrier to the Middle East to build military pressure on Tehran. The president spoke at Fort Bragg in North Carolina. When asked if he wanted "regime change" in Iran, Trump replied, "Seems like that would be the best thing that could happen." He did not specify who should replace Supreme Leader Ayatollah Ali Khamenei but added, "there are people." Trump has previously avoided strong calls for regime change, fearing chaos. Meanwhile, the exiled son of Iran's last shah urged international action after Tehran's harsh crackdown on protests. Trump’s move comes amid ongoing efforts to get Iran to limit its nuclear program in a new deal.