“We are headed for a big multi-train pile-up,” Johanns said on the Senate floor Tuesday. “The majority would rather wash their hands of the responsibility of complying with the spending caps.”

Johanns criticized Senate Democrats for not complying with the spending levels set by law under the Budget Control Act (BCA). The BCA set spending levels for the year at $967 billion, but Democrats passed a budget that exceeded that spending level by nearly $90 billion more.

“We agreed to spend no more than $967 billion. … That’s simply a whole lot of spending, almost $3 billion a day,” Johanns said. “But my colleagues on the other side want to spend even more — nearly $1 trillion. They want to pretend the Budget Control Act was never passed into law.”

A government shutdown is possible if a short-term spending deal isn’t reached by Oct. 1. Some Republicans in the Senate, lead by Sens. Marco RubioMarco Antonio RubioOvernight Defense: Tillerson, Trump deny report of rift | Tillerson says he never considered resigning | Trump expresses 'total confidence' in secretary | Rubio asks Army to kick out West Point grad Rubio asks Army to kick out West Point grad with pro-communist posts GOP establishment doubts Bannon’s primary powers MORE (R-Fla.) and Mike LeeMichael (Mike) Shumway LeeWhatever you think the Alabama special election means, you’re probably wrong How the effort to replace ObamaCare failed Overnight Regulation: Trump temporarily lifts Jones Act for Puerto Rico | Bill would exempt some banks from Dodd-Frank | Senators unveil driverless car bill MORE (R-Utah), have called on the GOP to oppose any spending deal that funds ObamaCare.

Later in the fall, the government is also expected to reach its borrowing limit. The Budget Control Act was negotiated in 2011 — the last time the debt ceiling was reached — to continue to fund the government at reduced spending rates in exchange for raising the debt ceiling by more than $2 trillion.

Johanns said that the Democrats' plan to spend at higher levels than allowed under the BCA would lead to another sequester — across the board spending cuts.

“Ignoring the BCA spending levels isn’t just free money that we can print down at the Treasury Department. It sets up yet another round of sequester cuts,” Johanns said. “Their plan is to keep spending us right into another sequester.”

Currently, the Senate is working on the first of 12 appropriations bills, S. 1243, the Transportation, Housing and Urban Development (THUD) Appropriations bill, which funds government transportation and housing agencies.

Democrats chose to debate the THUD appropriations bill first to highlight the stark spending difference between the two chambers, in an effort to push Republicans into a budget conference committee. 

The House and Senate THUD bills have a  $10 billion spending difference — setting up the potential for a challenging conference committee. The Senate bill is $54 billion, while the House has a $44 billion bill, which is a cut of $7 billion from last year’s spending level.