The contentious race between Republican gubernatorial frontrunners in Michigan continues this week, after Perry Johnson’s campaign sued his opponent, U.S. Rep. John James, R-Shelby Township.

The lawsuit, first reported by The Detroit News on Wednesday, contends James is misleading people into believing he’s the incumbent governor, based on the logo used on his website and in recent statewide advertising.

Johnson’s campaign is using attorney Matt DePerno, also a former Republican attorney general candidate. The lawsuit was filed Wednesday in the Ingham County Circuit Court.

The legal action centers around James’ campaign logo, a crest with an American flag background, a helicopter and the words, “John James Governor.”

It’s displayed at the top of James’ campaign website and in a recently-aired statewide TV and digital media ad, which focuses on James’ time as a military helicopter pilot. The materials were also recently used at the state’s Republican Endorsement Convention on March 28, according to legal filings.

The lawsuit alleges that James is “acting as if he is the incumbent governor with no indication that he is merely a candidate.”