On Wednesday morning, shortly before a majority of GOP senators cast their votes for Thune, U.S. Senator Ted Cruz appeared to abandon fellow Texas U.S. Senator John Cornyn, announcing he would back U.S. Senator Rick Scott of Florida for the vaunted position.

Sen. John Cornyn, the state’s senior senator, is running to succeed longtime Republican leader Mitch McConnell of Kentucky. The three-way race for majority leader will be decided this week. Here are five things to know about the race:

Republican Sen. John Thune of South Dakota was elected new Senate majority leader, replacing Sen. Mitch McConnell of Kentucky, who is stepping aside. The contest to be the face of Senate Republicans is coming to a head this week. One issue contenders might want to avoid during the final stretch is Trump's ambitious tariff plan.