Ahead of 2nd round of nuclear negotiations, U.S. and Iran harden positions

Iran and the U.S. confirmed that a second round of talks over Iran’s nuclear program would take place this weekend in Rome. But at the same time, both the U.S. and Iran have hardened their negotiating positions after describing the first round as constructive. Nick Schifrin reports. PBS News is supported by - https://www.pbs.org/newshour/about/funders