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Cornyn had previously served as chairman of the National Republican Senatorial Committee (NRSC). Thune had reportedly been considering a challenge to Cornyn for the whip spot.

Prior to serving as Conference chairman, Thune served as vice chairman of the Conference and also was chairman of the Senate Republican Policy Committee. 

Meanwhile, the race to become the next chairman of the NRSC has begun to heat up. Sen. Jerry MoranJerry MoranGOP lawmakers lead way in holding town halls Yahoo reveals new details about security A guide to the committees: Senate MORE (R-Kan.) is running for the job and Sen. Rob PortmanRob PortmanMcCaskill investigating opioid producers Overnight Finance: Senators spar over Wall Street at SEC pick's hearing | New CBO score for ObamaCare bill | Agency signs off on Trump DC hotel lease GOP senators offer bill to require spending cuts with debt-limit hikes MORE (R-Ohio) is also considering a bid.