5 things to know for Jan. 21: Greenland takeover, Usha Vance pregnancy, Immigration crackdown, Train crashes, Amazon prices

CNN By Alexandra Banner, CNN A powerful winter storm is poised to hammer the eastern half of the US with heavy snow and dangerous ice later this week. Fueled by a brutal Arctic blast, it’s also set to deliver the season’s coldest air yet to millions of Americans. Here’s what else you need to know