The union that represents letter carriers in Saskatoon says its members have been ordered by Canada Post to deliver a graphic anti-abortion flyer that targets Liberal Leader Justin Trudeau.

Julee Sanderson of the Canadian Union of Postal Workers says letter carriers are upset about the violent nature of the flyer and some have balked at delivering them.

She says the flyer from a group called the Canadian Centre for Bio-Ethical Reform is in a white envelope that says "Important Election Information Enclosed."

The flyer itself includes a picture of an aborted fetus and of Trudeau.

It includes a statement that says Trudeau supports abortion and a vote for Trudeau is a vote for this, referring to the picture.

Sanderson says Canada Post has told the union that the corporation is not responsible for the content of mail and is legally obligated to deliver the flyers.