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.

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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 McConnellSessions: 'We should be like Canada' in how we take in immigrants NSA spying program overcomes key Senate hurdle Overnight Finance: Lawmakers see shutdown odds rising | Trump calls for looser rules for bank loans | Consumer bureau moves to revise payday lending rule | Trump warns China on trade deficit MORE (R-Ky.), who raised $2.2 million for the quarter. Sens. Al FrankenAlan (Al) Stuart FrankenPawlenty opts out of Senate run in Minnesota EMILY’s List president: Franken did 'right thing for Minnesota' Dem pledges to ask all court nominees about sexual harassment history under oath MORE (D-Minn.) and Kay HaganKay Ruthven HaganPolitics is purple in North Carolina Democrats can win North Carolina just like Jimmy Carter did in 1976 North Carolina will be a big battleground state in 2020 MORE (D-N.C.) both raised around $2 million. The fundraising quarter ended June 30, and reports are due Monday.