Lawmakers also asked the General Accounting Office, an investigative arm of Congress, to study the issue.
Yet a commission appointed by Congress to study protecting children online has pointedly declined to recommend mandatory filtering.
That agency had been assigned by Congress to study the collapse of the World Trade Center and the city's emergency response.
The Jones commission, which has 14 members, including former or retired military officers, Defense Department officials and law enforcement officers, was created this year by Congress to study the Iraqi security forces and report its findings this fall.
Gov. James S. Gilmore III of Virginia, a Republican who is chairman of the Advisory Commission on Electronic Commerce, created by Congress to study Internet taxation, favors a tax-free Internet to foster development of e-commerce.
The recommendations follow in part the report of the Amtrak Reform Council established five years ago by Congress to study ways to restructure the railroad, which has run deeper and deeper in the red.
