Text messages are going out to Indiana residents in Republican Senate districts, urging support for mid-decade redistricting efforts as advocacy groups ramp up pressure on lawmakers.

Lawmakers will return to the statehouse on December 1 to discuss mid-decade redistricting.

WATCH BELOW: WHO IS BEHIND FAIR MAPS INDIANA

The messages, which reference countering "the left's plan to flip the House" and maintaining "our House majority," are being sent by Fair Maps Indiana, a 501(c)(4) issue advocacy nonprofit based in Indiana. The organization is targeting constituents in Senate Republican districts where senators haven't publicly endorsed redistricting efforts.

"What we've rolled out is an Indiana online petition. So what that does is give them an opportunity to sign that petition, deliver i

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