Employment Minister Jason Kenney tweeted an anti-union joke before deleting the message early Tuesday morning.
"Just wrapped up a meeting with several staff members, at midnight. Good thing they're not unionized," Kenney tweeted shortly after midnight. The tweet was deleted but screencapped by a number of people.
Kenney replaced the tweet with one scrubbed of the jab at unions later that night.
Just wrapped-up a meeting with several staff members, at midnight. #beststaffever— Jason Kenney (@kenneyjason) November 19, 2013
The tweet was noticed by NDP's employment critic Jinny Sims and progressive political site Press Progress.
The Conservative Party passed a party policy at its latest convention that would oppose the mandatory enrollment of workers in unions and allow them to opt out of union dues.