while a prominent judge warned some protesters could face the death penalty. president trump has strongly supported the protesters, tweeting, "the people of iran are finally acting against the brutal and corrupt iranian regime. the u.s. is watching." and at the u.n. today, u.s. ambassador nikki haley echoing the president. >> we must not be silent. the people of iran are crying out for freedom. >> reporter: it's the sixth straight day of these protests. hundreds arrested. at least 21 killed. the largest demonstrations since 2009, but back then, it was millions in the streets. now, it's tens of thousands. still, the world seeing images like this, a young woman in a cloud of tear gas, her clenched fist raised high. what sparked these protests? iranians we talk to say it's the economy, the nuclear deal many hoped would spur growth and raise their incomes. it hasn't. and now, they're desperate and angry. david? >> terry moran, great to have you with us. next, to north korea tonight. in a new year's address, kim jong-un saying a nuclear launch button is always on his desk. but also offering to have a die