A long-anticipated hearing on legislation to protect U.S. elections from cyberattacks was postponed Wednesday over concerns the legislation did not have enough Republican support.

A spokeswoman for Senate Rules and Administration Committee Chairman Roy Blunt Roy Dean BluntSenate to push funding bill vote up against shutdown deadline Social media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Mo.) confirmed to The Hill that the markup had been postponed, shortly before it was scheduled to begin.

A GOP Senate aide told The Hill that the secretaries of several states had “expressed concerns about certain provisions” in the legislation.

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“In order for a truly bipartisan election security bill to reach the floor, additional majority support is necessary,” the aide said.

The legislation, promoted by Sens. James Lankford James Paul LankfordMcConnell works to lock down GOP votes for coronavirus bill Charities scramble to plug revenue holes during pandemic Warren calls for Postal Service board members to fire DeJoy or resign MORE (R-Okla.) and Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.), would help guard election systems against cyberattacks.

Klobuchar said in a statement that she was "disappointed" by the markup's delay, thanking Democrats who supported it and calling it "irresponsible" to not pass legislation ahead of the November midterm elections.

"For everyone else who delayed this action today, I hope that you will listen to the clarion cry of our intelligence community and continue to work with us and reschedule the markup and pass the bill into law," she said.

Vermont Secretary of State and National Association of Secretaries of State (NASS) President Jim Condos (D) had criticized the bill during a press call on Tuesday, saying that he could not support the legislation as currently written, Politico reported.

State election officials had raised concerns over the bill since Lankford and Klobuchar introduced it last December; the senators have since introduced new versions of the legislation to address some of those worries.

Blunt unveiled his amended version of the legislation last week, which removes the initial version's requirement that states conduct post-election audits with paper records.

The new version of the bill would also mandate that the Homeland Security secretary establish a "template" for states receiving federal election security funds when drafting plans on how to combat election cyber threats.

A bipartisan group of lawmakers on the House Intelligence Committee — Reps. Tom Rooney Thomas (Tom) Joseph RooneyHouse Dem calls on lawmakers to 'insulate' election process following Mueller report Hill-HarrisX poll: 76 percent oppose Trump pardoning former campaign aides Dems fear Trump is looking at presidential pardons MORE (R-Fla.), Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.), Jim Himes James (Jim) Andres HimesMany Democrats want John Bolton's testimony, but Pelosi stays mum SEC's Clayton demurs on firing of Manhattan US attorney he would replace Democrats face tough questions with Bolton MORE (D-Conn.) and Terri Sewell Terrycina (Terri) Andrea SewellRevered civil rights leader Rep. John Lewis lies in state in the Capitol House approves Clyburn proposal to rename voting rights bill after John Lewis John Lewis carried across Edmund Pettus Bridge for last time MORE (D-Ala.) — introduced a companion election security bill in the House earlier this month.