3/9 - Sec. Kristi Noem, Rep. Tom Suozzi, Rep. Brian Fitzpatrick, Fiona Hill

This week on "Face the Nation with Margaret Brennan," after a whiplash week of on-again, off-again tariff announcements, Canadian ambassador to the U.S. Kirsten Hillman joins to discuss the costs and consequences of a trade war. Plus, former White House Russia expert Fiona Hill discusses President Trump's diplomatic pivot on Ukraine. China announced retaliatory tariffs on U.S. agricultural products and targeted 25 American companies in response to the now 20% blanket tariffs President Trump placed on all Chinese goods. Anna Coren reports from Beijing with the latest. As President Trump threatens tariffs on the Canadian dairy and lumber industry — while holding off on broader tariffs on goods covered under the USMCA until April — Canadians are also dealing with a transfer of power, with Prime Minister Justin Trudeau set to step down. Ed O'Keefe reports from Ottawa. Homeland Security Secretary Kristi Noem tells "Face the Nation with Margaret Brennan" that the authorities that she has are "broad and extensive" as she discusses her plans at the helm of the agency.