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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 McConnellLawmakers feel pressure on guns Bipartisan group of House lawmakers urge action on Export-Import Bank nominees Curbelo Dem rival lashes out over immigration failure 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 HarkinThomas (Tom) Richard HarkinTrump should require federal contractors to follow the law Orrin Hatch, ‘a tough old bird,’ got a lot done in the Senate Democrats are all talk when it comes to DC statehood MORE (D-Iowa), Mike CrapoMichael (Mike) Dean CrapoBeware of the bank deregulation Trojan horse Senate Republicans call on Trump to preserve NAFTA Dems rip Trump's Fed pick as Senate panel mulls three key nominees MORE (R-Idaho), Jay RockefellerJohn (Jay) Davison 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 CochranOvernight Finance: Breaking down Trump's budget | White House finally releases infrastructure plan | Why it faces a tough road ahead | GOP, Dems feud over tax-cut aftermath | Markets rebound McConnell tees up budget deal McConnell urging Mississippi gov to appoint himself if Cochran resigns: report MORE (R-Miss.) congratulated Grassley via tweets.