Washington (CNN) - With pressure mounting back home to curb government spending and cut deficits, the Senate will vote Monday night on a measure aimed at banning all legislative earmarks for the next two years, but multiple aides on both sides of the aisle say it's not expected to clear a 67-vote threshold required to pass.
If approved, the two-year Senate moratorium would bar any legislation that includes a provision "included primarily at the request of a Senator or Member of the House of Representatives…targeted to a specific State, locality or Congressional district, other than through a statutory or administrative formula-driven or competitive award process," according to a copy of the amendment which is sponsored by Democratic Sen. Claire McCaskill of Missouri and Republican Sen. Tom Coburn of Oklahoma.
Supporters of the ban say many earmarks waste taxpayer dollars, and they hope Monday's vote helps build momentum for the ban even if they can't pass it right now.
"The purpose (of the vote) is to put people on the record and see where we are at," said an aide to a Democratic senator who supports the ban. "This won't be the last time we do this."
Earlier this month, Senate Republicans voted nearly unanimously to forgo earmarks, but that ban is voluntary while the McCaskill/Coburn amendment would be enforceable. In the meantime, Democrats only have a handful of senators who are on-the-record supporting the ban.
In the House, Republicans recently voted to renew their voluntary prohibition on earmarks. Democrats have a more limited ban on earmarks, barring them to for-profit companies.
The vote Monday is procedural and not directly on the ban. It will be offered on an unrelated food safety bill that is expected to clear the Senate as early as Monday night.