A Texas native, Ms. Rollins worked in the first Trump White House and has also led two influential conservative think tanks.

The sprawling U.S. Department of Agriculture controls policies, regulations and aid programs related to farming, forestry, ranching, food quality and nutrition.

Mexican President Claudia Sheinbaum threatened to retaliate with her own tariffs against the United States, after President-elect Trump suggested he would impose a 25 percent tax on imported goods from Mexico if her country did not stop the flow of drugs across the border. In remarks on Tuesday, Sheinbaum said that drugs were a U.S.…