After weeks of escalating tension, US and Iranian officials faced each other Thursday at the UN Security Council, where America's envoy renewed threats against the Islamic Republic despite President Donald Trump's efforts to lower the temperature between the two adversaries. The US was joined by Iranian dissidents in rebuking the government's bloody crackdown on nationwide protests that activists say has killed at least 2,637 people. Colleagues, let me be clear: President Trump is a man of action, not endless talk like we see at the United Nations, Mike Waltz, US ambassador to the UN, said in a statement. He has made it clear that all options are on the table to stop the slaughter. And no one should know that better than the leadership of the Iranian regime. Waltz's remarks came as the prospect of US retaliation for the protesters' deaths still hung over the region, though Trump signaled a possible de-escalation, saying the killing appeared to be ending. By Thursday, the protests ..