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 McConnellMcConnell sees Ohio in play as confidence about midterms grows   Giuliani: White House wants briefing on classified meeting over Russia probe GOP senators introduce Trump's plan to claw back billion in spending MORE (R-Ky.), who raised $2.2 million for the quarter. Sens. Al FrankenAlan (Al) Stuart FrankenRepublicans are strongly positioned to win Congress in November Senators introduce bill to overhaul sexual harassment policy Ex-White House ethics counsel: More evidence against Trump than there ever was against Nixon MORE (D-Minn.) and Kay HaganKay Ruthven Hagan2020 Dems compete for top campaign operatives Senate GOP rejects Trump’s call to go big on gun legislation Politics is purple in North Carolina MORE (D-N.C.) both raised around $2 million. The fundraising quarter ended June 30, and reports are due Monday.