Minaj, whose latest album, "Queen," was released Aug. 10, addressed the cancellation to fans directly with video posted on Twitter.
"Hey you guys. Future and I will now start the European leg of our tour first, so those dates will stay exactly the same, and the U.S. leg of the tour will now start in May," she said in the video. "And so, because of that, with Future's schedule, I may have to take another co-headliner, or I may just do it like I did with the 'Pinkprint Tour,' and it wouldn't be, like, a co-headliner. I probably would just have like three or four opening acts. I still am going to do Australia in January, and this is all happening because I pushed my album back two months, and I just finished writing and recording literally hours before the album came out. So now, I just simply don't have the time to rehearse and be on the road in time to give you guys the level of a show I need to give. (Creative director) Jamie King and I are working tirelessly to give you guys the best show of my life, and I really apologize, but it'll be worth it."
Minaj’s video message goes against unverified reports that the cancellation of the tour is because of poor ticket sales.
Rolling Stone reported that refunds for the canceled North American tour will be at the point of purchase.
Minaj will announce new North American dates at a later time.