A round of eleventh-hour objections is throwing a curveball into the Senate's consideration of a mammoth stimulus package.

Senate leadership announced the deal on the $2 trillion bill shortly after 1 a.m., and want to pass it Wednesday as they face intense pressure to take steps to reassure an American public and an economy rattled by the coronavirus .

"In my view, it would be an outrage to prevent working-class Americans to receive the emergency unemployment assistance included in this legislation," Sanders said in a statement.

"Unless these Republican senators drop their objection, I am prepared to put a hold on this bill until stronger conditions are imposed on the $500 billion corporate welfare fund to make sure that any corporation receiving financial assistance under this legislation does not lay off workers, cut wages or benefits, ship jobs overseas or pay workers poverty wages," Sanders continued.

Putting a "hold" on a bill would force McConnell to go through days of procedural loopholes that could delay the bill into the weekend or even early next week.

The unemployment provision includes four months of bolstered unemployment benefits, including increasing the maximum unemployment benefit by $600.

But the GOP senators say that the agreement, which they are calling a "drafting error," could prompt individuals who would make less working to leave their jobs, or not actively return to working. "Unless this bill is fixed, there is a strong incentive for employees to be laid off instead of going to work. ... We must sadly oppose the fast-tracking of this bill until this text is addressed, or the Department of Labor issues regulatory guidance that no American would earn more by not working than by working," Graham, Sasse and Scott, of South Carolina, said in a joint statement.

The back-and-forth comes as senators are scrambling to learn the details of the mammoth package.

Graham said they learned the details of the deal during a 92-minute conference call Senate Republicans had on Wednesday morning. They are asking for a vote on an amendment that would cap unemployment benefits at 100 percent of a person's salary.

Their demand sparked immediate bipartisan pushback .

A Senate GOP aide pushed back against the four senators, underscoring the divisions within the caucus, saying that "nothing in this bill incentivizes businesses to lay off employees, in fact it’s just the opposite." A Senate GOP aide pushed back against the four senators, underscoring the divisions within the caucus, saying that "nothing in this billbusinesses to lay off employees, in fact it’s just the opposite."