HELENA, Mont. (AP) — Sen. Ted Cruz may be chatting up Montanans for their vote, but his robocalls are pushing the wrong buttons for some.

Such automated phone calls are illegal in Montana, and are prompting a few complaints.

Montana's Commissioner of Political Practices was alerted to the calls earlier this week but says he doesn't have the authority to enforce the state law that prohibits political robocalls.

Cruz is hoping to prevent Donald Trump from winning the Republican nomination outright. Montana, which awards only 27 delegates, could be crucial in Cruz's presidential bid.

Greg Trangmoe, a state co-chair for Ohio Gov. John Kasich's campaign, says the robocalls show that Cruz isn't playing by Montana rules. Earlier this year, the Cruz camp explored the possibility of trying to disqualify Kasich from the June primary.