"I think prioritization is just a default by another name," Lew said.
He also fended off attempts by the top Republican on the committee, Sen. Orrin Hatch of Utah, and other GOP senators to learn how long a debt limit extension the president would like to see.
"Our view is this economy would benefit from more certainty and less brinksmanship. So the longer the period of time is, the better for the economy," said Lew, who also repeated Obama's willingness to accept a short-term extension for now.
The frustrating standoff in Washington is weighing down each side's poll numbers, but Republicans are taking the worst drubbing. A Gallup poll put the approval rating for the Republican Party at a record-low 28 percent. Polls have consistently said the Republicans deserve the greater share of blame for the shutdown.