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 McConnellSenate passes 0B defense bill Overnight Health Care: New GOP ObamaCare repeal bill gains momentum Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea MORE (R-Ky.), who raised $2.2 million for the quarter. Sens. Al FrankenAlan (Al) Stuart FrankenGOP eying 'blue slip' break to help Trump fill the courts Overnight Regulation: FTC launches probe into Equifax | Dems propose tougher data security rules | NYC aims to slash greenhouse gas emissions | EPA to reconsider Obama coal ash rule Overnight Cybersecurity: Kaspersky to testify before House | US sanctions Iranians over cyberattacks | Equifax reveals flaw that led to hack MORE (D-Minn.) and Kay HaganKay HaganLinking repatriation to job creation Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock MORE (D-N.C.) both raised around $2 million. The fundraising quarter ended June 30, and reports are due Monday.