WATERVILLE, Maine — A Republican mayor of a Maine city now faces a vote that could remove him from office over his tweets mocking a survivor of the Parkland, Florida, school shooting.

Nick Isgro now must face a recall vote in Waterville, where he was elected to a second term last November. Isgro’s tweet in early April was directed at David Hogg, who gained prominence as a gun control advocate after the shooting that left 17 people dead.

The recall effort is being led by former Waterville mayor Karen Heck, a Democrat who endorsed Isgro during his first run for mayor.

Isgro has blamed the recall effort on “well-connected and wealthy political elites.”