A Canadian woman allegedly mailed a letter addressed to President Trump containing the poison ricin and the threat "give up and remove your application for this election," court papers filed Tuesday show.

Driving the news: Pascale Cecile Veronique Ferrier, 53, was arrested trying to enter New York from Canada on Sunday. She appeared briefly in a Buffalo, N.Y., courtroom where a judge entered a not guilty plea on her behalf to the charge of threatening the president, per CBC.