A group of Republican senators said Monday that thousands of voter ballots are unlikely to reach military service members until after Nov. 6.

One day ahead of the election, Sens. John CornynJohn CornynSenate approves .3 trillion spending bill, sending to Trump GOP senator threatened to hold up bill over provision to honor late political rival: report Overnight Health Care: House passes .3T omnibus | Bill boosts funds for NIH, opioid treatment | Senators spar over ObamaCare fix | 'Right to Try' bill heads to the Senate MORE (R-Texas), Kelly AyotteKelly Ann AyotteAudit finds US Defense Department wasted hundreds of millions of taxpayer dollars US sends A-10 squadron to Afghanistan for first time in three years No, the US did not spend million on a gas station in Afghanistan MORE (R-N.H.), John McCainJohn Sidney McCainMcCain asks Trump's CIA pick to explain ties to torture Petraeus: Haspel will explain actions in nomination hearing Afghanistan is our longest war ever and Congress has abandoned all responsibility MORE (R-Ariz.), Rob PortmanRobert (Rob) Jones PortmanLawmakers introduce bipartisan bill to speed up infrastructure permitting Overnight Tech: Zuckerberg breaks silence on Cambridge Analytica controversy | Senate passes sex trafficking bill | EU pushes new tax on tech | YouTube toughens rules on gun videos Senate passes controversial online sex trafficking bill MORE (R-Ohio) and Marco RubioMarco Antonio RubioRubio: 'Hyperventilating' about Bolton unfounded George Clooney writes Parkland students: 'You make me proud of my country again' Biden praises Parkland students fighting for gun reform: ‘They’re going to win’ MORE (R-Fla.) sent a letter to Defense Secretary Leon Panetta to express their concern over delays in ballots reaching military voters overseas.

“We write to express concerns over another serious failure by the Department of Defense (DoD) to safeguard the voting rights of our overseas military service members, which we believe could result in the imminent disenfranchisement of thousands,” the letter stated.

Mail redirection in the military can take between 14 to 50 days, meaning a ballot could reach the voter possibly more than a month after ballots have to be mailed back in order to be counted. The Military Postal Service Agency (MPSA) identified problems with the system after the 2010 election, but hasn’t implemented changes.

More from The Hill:
♦ State ballot measures take aim at 'ObamaCare,' abortion rights
♦ Conflict-of-interest concerns amid race to implement health law
♦ Two sentenced to prison for online copyright infringement
♦ Twitter to flag tweets accused of copyright violations
♦ Light on details, business calls for action on ‘fiscal cliff’
♦ Key Dem senator pushes for additional Sandy spending bill
♦ GOP pounce on Obama, CBS News over unaired Libya remarks
♦ Ron Paul questions value of federal flood aid for Sandy victims

“DoD’s failure to fix this longstanding problem means that the blank ballots of thousands of overseas service members, as well as some who have recently returned from overseas, could be currently trapped in an archaic and inefficient mail forwarding system,” the senators wrote. “These ballots are unlikely to reach these service members until after Election Day has passed."

The senators advised Panetta to create a centralized mail redirection system and modernize military mail delivery.

“We are perplexed as to why DoD did not do everything in its power to modernize the system for redirecting blank ballots in order to eliminate this roadblock for military service members, per the top 2010 recommendations from MPSA,” the letter stated. “As we know you agree, they deserve to have a voice in choosing their elected leaders. Our men and women in uniform should be able to participate in the very same democratic system of government that they defend, not be relegated to mere spectator status because their ballot never reached them.”

The senators asked that a new mail system be in place by the next election, in 2014.