AUSTIN— With Republicans regaining majority control of the Senate, U.S. Sen. John Cornyn, R-Texas, is making his bid to become that chamber’s majority leader. U.S. Sen. Mitch Mc-Connell, R-Kentucky, had previously announced he would step down as party leader. Republicans will hold at least a 53-45 edge in January, with Senate races in two states still undecided as of Friday morning.