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Democrats say Republicans didn't take issue with the writing style of bipartisan bills they backed earlier in the session until hot button issues were on the table. is now unclear; under a new voter-approved law, Oregon legislators who have 10 unexcused absences are banned from reelection.

“This is about abortion, guns and transgender rights,” said Senate Majority Leader Kate Lieber. “The timing of this is such that they’re walking out on important legislation that Oregonians sent us here to do.”

GOP senators did not show up again Friday, blocking legislative business, and Democrats said they would try again Saturday morning.

The 1979 law in question specifically requires bill summaries to have an eighth- or ninth-grade reading level — measured by a score of at least 60 on something called the Flesch readability test. It's unclear if it was ever followed or consulted for past bill summaries, but it was dusted off recently by a Republican Senate employee who dug it out the Capitol archives.

“It’s important that we follow the law because, if we’re passing laws today, are we just expecting in, you know, 20, 30, 40 years that people are just going to ignore the laws that we have on the books that we all passed? I don’t think we would appreciate that,” said Senate Republican leader Sen. Tim Knopp.

“And so I’m pretty sure that the legislators that did that back then also wanted the law followed."

The namesake of the Flesch test was Rudolf Flesch, a Vienna-born psychologist and readability expert specializing in the art of plain talk.

Designed in the 1940s to measure how easy it is to read and understand a text, the Flesch readability test factors word and sentence length to determine the grade level of a text. Scores range from 1 to 100, with 100 being the easiest to read and 1 being the most difficult. A score between 60 and 70 indicates an eighth- or ninth-grade reading level.

Flesch's readability formula eventually inspired lawmakers across the country in the 1970s to use the test to make insurance policies easy-to-read for everyday consumers. In 1975, scientist J. Peter Kincaid refined the formula into the Flesch-Kincaid Readability test to help U.S. Navy personnel improve technical documents.

By 1979 in Oregon, lawmakers had figured out a way to use the Flesch test to shape legislation with plain language, too. Senate Bill 543 passed with overwhelming bipartisan support at the time.

Gary Wilhelms, the Oregon house minority leader in 1979, was one of 31 bipartisan votes to pass the readability bill. On Monday, the 85-year-old Republican addressed the resurfacing of the law decades after it's passage in a statement released by the GOP senators.

“Transparency prevailed then as it should today,” Wilhelms said. “The law is the law, and I'm glad the Senate Republican Caucus is attempting to enforce this statute today.”

In an interview with The Associated Press, Wilhelms said his memory of the political moment in 1979 that shaped the readability law is fuzzy. He described it as “minor legislation."

Justin Brecht is the senior policy analyst for the Senate Republican caucus who knocked the dust off the law four decades later. But even with that legislation, it would take more digging and a legal opinion to understand how it fit into .

“Well, at first it was, ‘Well, what’s this statute that it says these measure summaries have to comply with?’” Brecht said. “Most don’t even know what the Flesch readability standard is."

Republican lawmakers have until May 12 before those with 10 unexcused absences will be banned from reelection under the new law passed by 70% of Oregon voters last year.

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Komenda reported from Seattle. Associated Press writer Claire Rush in Salem, Oregon, also contributed.

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