Chrystia Freeland, the deputy prime minister who led Canada’s response to the first Trump administration, resigned on Monday from her cabinet role as finance minister, according to her resignation letter to Prime Minister Justin Trudeau.

The revelation came hours before she was scheduled to outline the government’s commitments to improve border security with the United States.

In her resignation letter, Ms. Freeland indicated that Mr. Trudeau attempted to force her out of the position last week. She had successfully renegotiated the North American Free Trade Agreement with the first Trump White House.

This is a developing story.