About 50 members of the American Postal Workers Union and the National Association of Letter Carriers gathered down the street from Capitol Hill in a show of support for Canada Post employees.

Canada Post says its normal holiday delivery service guarantees have been restored across most of the country.

The CUPW and Canada Post are not negotiating as both sides wait for the federal government to appoint a mediator-arbitrator.

Protest organizers outside a Canada Post facility in London said vehicles were turned away or delayed during a demonstration on Monday morning.

A group representing Canadian businesses is praising the federal government for legislating postal employees back to work, saying it will help clear hefty backlogs of mail ahead of the busy holiday season.

Bill C-89 was passed by a 53-25 margin, with four abstentions.

The move comes as a special meeting of the Senate is expected to examine legislation forcing an end to the rotating strikes at Canada Post.

The Senate is sitting Saturday to debate the back-to-work bill that passed the House of Commons.

The legislation passed the House of Commons at about 1 a.m. local time.

Labour Minister Patty Hajdu says the federal Liberals have given the House of Commons notice that they're prepared to legislate Canada Post employees back to work.