Chrystia Freeland, the deputy prime minister who led Canada’s response to the first Trump administration, resigned abruptly on Monday from the cabinet in a stinging rebuke to Prime Minister Justin Trudeau, marking the first open dissent from any cabinet member and raising questions about his hold on power.
The revelation, in a letter of resignation, came hours before Ms. Freeland, who had been the finance minister, was scheduled to outline the government’s commitments to improve border security with the United States as part of an interim budget.
