Sen. Tom Cotton is working closely with Sen. Kelly Loeffler to boost her prospects in a critical Georgia runoff election set for Jan. 5, with the Arkansas Republican and potential 2024 presidential contender raising money and advertising for her campaign.

Cotton and his political team are in regular contact with Loeffler and her campaign and have been traveling to Georgia regularly since October. Cotton typically offers his colleague advice on messaging and delivers attacks on Raphael Warnock, Loeffler’s Democratic challenger, that some Republicans have hesitated to carry out. His top political aides have interacted similarly with their counterparts on the Loeffler campaign.