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According to Grassley's office, only 23 senators in history have cast more votes than Grassley. Grassley has been a member of the Senate since 1981.

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.), in congratulating Grassley on the accomplishment on the floor of the Senate, even referred to the Iowa senator’s Twitter account.

“And of course, we’re all familiar with his tweets,” McConnell said. “Much like the senator himself, they are truly one of a kind.”

Grassley, who sends his own tweets, is known for his unique abbreviations.

"This isn't just tweeting. This is avant-garde, stream of consciousness poetry. It's Jack Kerouac typing On the Road with his thumbs!" Comedy Central's Stephen Colbert said of Grassley's Twitter account earlier this year.

Senate colleagues Tom HarkinTom HarkinDistance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream MORE (D-Iowa), Mike CrapoMichael (Mike) Dean CrapoSenate Banking panel approves Trump's Fed, comptroller nominees Harvey damage adds urgency to flood insurance debate Don't let funding for US Forest Service go up in flames MORE (R-Idaho), Jay RockefellerJay RockefellerOvernight Tech: Trump nominates Dem to FCC | Facebook pulls suspected baseball gunman's pages | Uber board member resigns after sexist comment Trump nominates former FCC Dem for another term Obama to preserve torture report in presidential papers MORE (D-W.Va.) and Thad CochranWilliam (Thad) Thad CochranMcConnell tees up debt, government-funding vote National Flood Insurance Program is the next storm for hurricane survivors Trump exempts Citgo from Venezuela sanctions MORE (R-Miss.) congratulated Grassley via tweets.