This time, a group of prominent women from across the country say Trudeau should direct the Crown corporation to live up its legal obligations on pay equity.
The issue of differences in paycheques for rural mail carriers and urban letter carriers has been at the forefront of contract talks between Canada Post and its biggest union.
The negotiations have been extended twice since the weekend, when a deadline expired on a 72-hour job action notice issued last Thursday by the Canadian Union of Postal Workers.
An open letter sent to the prime minister today calls on Trudeau to keep his promise to support equal pay for work of equal value.
The letter is signed by 200 women primarily from English-speaking Canada, including actress Sarah Polley, author Naomi Klein and social activists Maude Barlow and Judy Rebick.
WATCH: Union delays job action for 24 hours as labour talks continue
© 2016 The Canadian Press