This week on “Face the Nation,” Margaret Brennan talks to acting White House chief of staff Mick Mulvaney, Senate Intelligence Committee Vice Chairman Mark Warner and 2020 Democratic presidential candidates Julián Castro and Marianne Williamson. Plus, CBS News national security correspondent David Martin reports on the U.S. military buildup against Iran. Source

Cannabidiol, a chemical compound extracted from hemp, is now at the center of a swiftly-growing industry which last year derived about $600 million in U.S. sales. Lee Cowan reports. Source

For one week every year, the center of the known pizza universe isn’t Naples, Italy, or New York (or even Chicago); it’s Las Vegas, when the International Pizza Expo rolls into town, bringing with it thousands of professional pizza-makers, and those dreaming of getting into the business. Luke Burbank talks with international pizza consultant Anthony Falco, aspiring pizzeria owners, and others who have pursued their dreams and are now rolling in dough. Source

Report emerged Sunday after a photo showed the young tourist from California restrained with handcuffs and with his head bowed Source

An emergency meeting was held in Vienna in an effort to save the Iran nuclear deal as Iran continues to provoke the west with aggressive actions in the Gulf. Roxana Saberi reports. Source

It’s been another day of pro-Democracy protests on the streets of Hong Kong. But the violence between demonstrators and police intensified on Sunday. Ramy Inocencio reports from Hong Kong. Source

Here’s a look at the top stories making headlines on the “CBS Evening News.” Source

Two American teenagers are in custody tonight in Rome. They are suspects in the stabbing death of a policeman. Police are investigating the release of a disturbing photo that shows one of the suspects blind-folded and handcuffed. Seth Doane reports. Source

Two American tourists have been arrested in the deadly stabbing of a police officer in Rome. Finnegan Lee Elder and Gabriel Christian Natale-Hjorth are being detained, and expected to be charged soon. Seth Doane reports. Source

At 22, Bernal is the youngest Tour winner in the post-World War II era Source