Trump tweets threat at Iran

President Donald Trump's explosive twitter threat to Iran's leader comes as his administration is ratcheting up a pressure campaign on the Islamic republic that many suspect is aimed at regime change. No one is predicting imminent war. But Trump's bellicose, all-caps challenge addressed to President Hassan Rouhani followed a speech by Secretary of State Mike Pompeo in which he accused Iran's leadership of massive corruption and widespread rights abuses and urged Iranians to rise up in protest.