Cornyn now has $5.9 million in the bank. The sum will help him ward off any primary challengers in the state, though none have emerged at this point.

It's unusual for senators not likely to face tough elections to raise such large sums, but Texas is a huge source of campaign donations and Cornyn is well-connected to the GOP's donor base after a two-term stint as head of the National Republican Senatorial Committee.

Cornyn edges Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellCollins: 'Extremely disappointing' ObamaCare fix left out of spending deal House poised to vote on .3T spending bill Budowsky: Stop Trump from firing Mueller MORE (R-Ky.), who raised $2.2 million for the quarter. Sens. Al FrankenAlan (Al) Stuart FrankenMcCabe oversaw criminal probe into Sessions over testimony on Russian contacts: report Academy president accused of sexual harassment: report Top Nike executive resigns amid workplace complaints: report MORE (D-Minn.) and Kay HaganKay Ruthven HaganSenate GOP rejects Trump’s call to go big on gun legislation Politics is purple in North Carolina Democrats can win North Carolina just like Jimmy Carter did in 1976 MORE (D-N.C.) both raised around $2 million. The fundraising quarter ended June 30, and reports are due Monday.