Today’s installment of campaign-related news items from across the country.

* We’re one day out from one of the nation’s most closely watched U.S. House primaries, with incumbent Rep. Thomas Massie facing Trump-backed Ed Gallrein in a GOP primary in Kentucky. Ad spending in this race has made it the most expensive House primary in U.S. history.

* On a related note, on the final day of campaigning before Kentucky’s primaries, Defense Secretary Pete Hegseth is hitting the trail with Gallrein. There is no modern precedent for a sitting Pentagon chief making in-person campaign stops for a candidate for public office.

* As for Massie, after the incumbent congressman received support from Republican Rep. Lauren Boebert, Donald Trump, who’s desperate to destroy Massie, threatened to support a primary campaign against the Colorado congresswoman.

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Steve Benen

Steve Benen is a producer for “The Rachel Maddow Show,” the editor of MaddowBlog and an MS NOW political contributor. He’s also the bestselling author of “Ministry of Truth: Democracy, Reality, and the Republicans’ War on the Recent Past.”

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• Monday’s Campaign Round-Up, 5.18.26: Kentucky’s Massie prepares to face primary voters