MARKETS WARY

Concerns that the shutdown could trim economic growth coupled with nervousness over a potential debt ceiling crisis later this month have weighed on stocks and pushed the US dollar close to an eight-month low.

While selling has been orderly so far, investors expect volatility to rise as the shutdown continues and the debt ceiling deadline nears.

Democratic Senator Charles Schumer told ABC's "This Week" he did not believe Boehner would let the nation go into default, as it would lead to chaos on financial markets, freeze lines of credit and cause a jump in interest rates.

"I believe Speaker Boehner will not do that when push comes to shove," Schumer said, adding that Boehner and Republicans would be forced "sooner or later" to stand up to the "hard right" in their party and give in. "They will have to back off."

View gallery."US Government shutdown

With the government shutdown still unresolved, Senate Majority Leader Harry Reid, D-Nev., leaves the …Obama and the Democrats say bills to fund the government and raise the debt ceiling could be resolved quickly if Boehner permitted votes on simple, no-strings-attached measures in the Republican-controlled House.

Asked about reports that around 20 House Republicans have said they would join some 200 Democrats in voting for such a bill - enough to pass it - Boehner told ABC that there were not enough votes in the chamber to pass such a bill.

White House spokesman Jay Carney said via Twitter that Boehner should prove he does not have the votes for a clean bill, known as a "continuing resolution," or CR, by putting a bill on the House floor. "The Speaker says there are 'not enough votes' to pass a clean CR? If he's right, why not prove it?" Carney said in a tweet.

Republicans have demanded that Democrats agree to delay implementation of Obamacare as part of any spending bill.

The law aims to provide health insurance to millions of Americans without coverage. Republicans argue it is a massive government intrusion into private medicine that will cause insurance premiums to skyrocket, put people out of work and eventually lead to socialized medicine.

The shutdown started on Tuesday and initially idled as many as 800,000 federal workers, shuttering all but essential government operations.

The Pentagon said on Saturday it would recall the vast majority of some 350,000 civilian Defense Department employees sent home during the shutdown. The announcement came as Democrats and Republicans in the House agreed to pay all furloughed employees retroactively once the government reopens.

NO MAGIC SOLUTION

In an interview with CNN, Lew repeatedly declined to say what would happen if Congress failed to raise the debt ceiling.

Some Republicans have argued that the US government would be able to continue to service its debt even if it did not have enough money to pay all of its bills. Lew declined to say whether that would be the case, but he argued that it would be just as bad if it missed other obligations like Social Security pension payments or Medicare payments to hospitals and doctors.

"There is no option that prevents us from being in default if we don't pay our bills," he told CNN's "State of the Union."

Lew said the Obama administration has determined that legally it does not have the authority to raise the debt ceiling on its own, as some Democratic lawmakers have suggested.

"There's a desire here for there to be some kind of a magic solution. There's an easy solution: a majority in Congress would do the right thing if given a chance to open the government. A majority in Congress would do the right thing if given a chance to let us pay our bills."

While most House Republicans have remained firmly opposed to reopening the government without some changes to Obamacare, Republicans in Democratic-leaning states, particularly in the Northeast, have been trying to build support for a revolt against that stance.

In an opinion piece on Sunday on local news website Philly.com, seven Republican House members from northeastern districts called for a measure to reopen the government without conditions.

"The fight to stop Obamacare cannot continue with the government shut down. That's why we support a short-term, clean funding bill to turn those lights back on," wrote the group, which included Representatives Charlie Dent of Pennsylvania and Frank LoBiondo of New Jersey.

The lawmakers also said they were talking with some Democrats on a possible compromise plan that would involve reopening the government for six months while repealing the medical device tax, a provision of Obamacare that is unpopular with Republicans and some Democrats.