President Trump said the goal of the negotiations with Iran is to achieve "full dismantlement" of Tehran's nuclear program. Why it matters: Trump's remarks in an "Meet the Press" interview aired Sunday are the first time he's publicly announced the ambitious goal since nuclear talks began with Iran a month ago.

President Donald Trump said he would impose secondary sanctions on nations or companies buying Iranian oil, ratcheting up pressure on Tehran as nuclear talks with the US hit a snag.