Missouri Republican leaders are calling for a federal investigation into political mailings that slam Attorney General and U.S. Senate candidate Josh Hawley.
The mailers do not have required disclaimers saying who is paying for them.
Treasurer Eric Schmitt said the mailers appear designed to help Democratic incumbent Claire McCaskill in her close race against Hawley for the seat that could determine which party controls the Senate. McCaskill's campaign denied involvement in the mailers.
The ads, which began appearing in mailboxes this week, encourage voters to support the Libertarian or Independent candidates by criticizing Hawley's position on gun rights and other issues