Former South Bend, Ind., Mayor Pete Buttigieg’s presidential campaign called on former New York City Mayor Michael Bloomberg to drop out of the Democratic presidential primary race in a memo released on Thursday, warning that Bloomberg’s presence in the race would propel Sen. Bernie Sanders to the Democratic nomination.

“If Bloomberg remains in the race despite showing he can not offer a viable alternative to Bernie Sanders, he will propel Sanders to a seemingly insurmountable delegate lead siphoning votes away from Pete, the current leader in delegates,” Buttigieg’s campaign wrote.

The campaign projected that if the dynamics of the primary do not change, Sanders would emerge from Super Tuesday as almost unbeatable, adding that Buttigieg was the strongest alternative to the progressive senator.

Read more at The Hill.