World News Roundup: 01/25

Pfizer begin trials of its Omicron vaccine. US troops on higher alert. Tom Brady hints at retirement. CBS News Correspondent Steve Kathan has today's World News Roundup. To learn more about listener data and our privacy practices visit: https://www.audacyinc.com/privacy-policy Learn more about your ad choices. Visit https://podcastchoices.com/adchoices