CTV National News for Wednesday, July 22, 2026: Trump's tariff strategy faces U.S. Senate scrutiny amid trade negotiations

U.S. President Donald Trump's top trade representative faces tough Senate questions as lawmakers press for answers on ongoing trade talks; Canada's premiers discuss looming U.S. tariffs while addressing energy, health care and national unity at their meeting in P.E.I; Tariff tensions have clouded the Gordie Howe bridge opening as new details emerge about Canada's proposed agreement with the U.S.