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:

Ahead of the U.S. Senate choosing its new majority leader, several Republican and advocacy groups in Texas issued statements opposing U.S. Sen. John Cornyn, R-Texas, from being considered. Long-time Republican Leader Mitch McConnell,

Who senators choose, and whether Trump ultimately endorses a candidate in the final hours, could set the tone for Trump’s attempts to assert control over the legislative branch.