The frontman for the industrial rock band Nine Inch Nails is putting the hammer to a trio of Alberta politicians.

Trent Reznor's representatives have sent a letter requesting the politicos refrain from any use of the band's logo.

That logo — an "N," an "I" and an inverted "N" — was featured prominently in a tweet featuring Calgary Mayor Naheed Nenshi and Alberta Premier Rachel Notley, and referencing Edmonton Mayor Don Iveson.

In the photo, the pair held up black T-shirts with the logo and the subtitle "Notley Iveson Nenshi" and the tagline "Building Alberta Together."

Notley and Nenshi

Alberta Premier Rachel Notley and Calgary Mayor Naheed Nenshi showed off their "Notley Iveson Nenshi" t-shirts to reporters at the Alberta legislature. (CBC )

Nenshi's office confirms that Reznor's people contacted them with "a very polite letter" this week expressing concern over the T-shirts, which are being sold by a third party not connected to the mayor or his office.

Nenshi says he understands why Reznor would be upset.

"Apparently it seems some people have been selling this T-shirt," he told Global Calgary. "Don't do that. So if you're someone on a website selling this T-shirt, quit it."

The mayor's office says the original three shirts were personal gifts printed for the politicians, and are "not the concern here."

Notley's office confirms she also received a letter from Reznor's lawyers.

"He basically just said, `Please don't use our logo — don't use it for any purposes. It's protected,"' says spokeswoman Cheryl Oates, who added there were no legal proceedings underway.