Agency pressures auditors of China-based companies being investigated for fraud.

China-based audit firms are withholding documents, agency says.

China-based audit firms are withholding documents, agency says.

Obama names SEC Commissioner Elisse Walter to replace Schapiro as chairman.

Obama names SEC Commissioner Elisse Walter to replace Schapiro as chairman.

SEC chairwoman fails to turn around the agency's image as a failed watchdog.

SEC chairwoman fails to turn around the agency's image as a failed watchdog.

Geithner breaks logjam by forcing SEC to put issue back on its agenda.