The president also reiterated his criticism that Canada “treats us very badly.” Trade talks between the nations collapsed last week.

© Demetrius Freeman for The New York Times

Asked whether the deployment of the Abraham Lincoln had gone on too long, the president said its deployment had lasted “not nearly long enough.”

© DVIDS, via Reuters

President Trump said that Ms. Leavitt, who recently gave birth to her second child, would be leaving to spend time with her family.

© Haiyun Jiang/The New York Times