Caitriona Perry is a Washington correspondent and U.S. bureau chief for RTE News-Ireland. She was in the Oval Office with other journalists to document yesterday's call.
Trump was congratulating Leo Varadkar on becoming prime minister, and mentioned that Irish reporters were among those listening.
Trump then pointed to Perry, called her over to his desk and asked where she was from.
Perry identified herself, and then Trump told Varadkar: "She has a nice smile on her face so I bet she treats you well."
Perry also tweeted the video. She described the encounter as a "bizarre moment.