Fed's Bernanke under pressure to undertake additional steps to aid economy.

Financial turmoil could elicit extended monetary stimulus from Fed.

Financial turmoil could elicit extended monetary stimulus from Fed.

Fed chairman's testimony meets with criticism from Republican Senators.

Fed chairman's testimony meets with criticism from Republican Senators.

Fed chairman could push for fiscal responsibility in testimony on Hill.

Fed chairman could push for fiscal responsibility in testimony on Hill.

Fed chairman acknowledges economic headwinds.