Republican Senate candidate and Indiana Rep. Todd Rokita is facing criticism for having received money from a casino interest group that would benefit from legislation he is pushing.

The Associated Press reported that Rokita, who is running to challenge Democratic incumbent Sen. Joe Donnelly, received more than $160,000 from Native American gambling interest groups.

At the same time, Rokita has sponsored legislation called the Tribal Sovereignty Act, which would exempt tribal business from the National Labor Relations Act.

The legislation was passed as part of a larger bill that passed on Wednesday.

Watch: Four Things to Watch as 2018 Election Season Officially Nears