It's a big day in Washington where Joe Biden is sworn in as the 46th president of the United States.

Northern Ireland's First Minister Arlene Foster tells Bloomberg Westminster's Roger Hearing and Sebastian Salek that Biden has made some very unfortunate comments about Ireland in the past, and if given the opportunity she'd give him a better understanding of the Belfast Agreement.

Plus, Bloomberg Opinion's Therese Raphael joins to talk about how big of a headache the China rebels will become for Boris Johnson, and whether Brexit "teething problems" are just that, or more.