Nicki Minaj performs onstage at the 2018 BET Awards at Microsoft Theater on June 24, 2018, in Los Angeles, Calif.
According to an announcement from Live Nation, Minaj has "decided to re-evaluate elements of production" and Future will no longer be part of the North American run.
The tour was set to kick off Sept. 23 in Washington, D.C., but now the tour will start in Europe on Feb. 21, 2019 in Munich, Germany.
The bulk of the postponed shows were in the U.S. and there were two Canadian shows planned: Toronto on Oct. 1 at the Scotiabank Arena and Vancouver on Nov. 13 at the Rogers Arena.
Tour opener 6ix9ine is not mentioned in the press release, so he will likely be unaffected by the changes.
The European leg of the tour continues through March 28, when the Barbie Dreams rapper is scheduled to perform in Geneva, Switzerland.
New North American dates will be announced at a later date.
The announcement of the cancellation comes shortly after Page Six published a report with an unnamed source with LiveNation who said Minaj is "spiraling out of control" and the tour is in danger of being cancelled.
The reports of low sales come after Minaj accused Travis Scott of using his girlfriend Kylie Jenner to promote his new album Astroworld on Sunday. Minaj's album, Queen, was released on August 10.
Minaj claimed that Jenner — who included a link to Scott's album on an Instagram post saying that she and the couple's daughter would be joining the Sicko Mode rapper on tour — was a huge factor behind the success of the album.
"I put my blood sweat & tears in writing a dope album only for Travis Scott to have Kylie Jenner post a tour pass telling ppl to come see her & Stormi. Lol. Im actually laughing," Minaj wrote on Sunday.
Minaj went on to write about Scott's high sales, suggesting they come from the fact he's selling album bundles online, which include merchandise and tour "season passes" that give fans priority venue entry and discounts.
Minaj doubled down on her criticism of Scott on Tuesday's episode of "Queen Radio" on Beats 1.