The House Ethics Committee just announced it is expanding its investigation of Ways and Means Committee Chairman Charles Rangel, D-N.Y., NPR's Andrea Seabrook reports from the Capitol.

The committee also reported that so far it has authorized nearly 150 subpoenas, interviewed more than 30 witnesses and analyzed more than 12,000 pages of documents.

Rangel, who has maintained his innocence, faces questions about a variety of issues.

Those include:

— Failure to disclose rental income from a villa in the Dominican Republic.

— The renting of four apartments in Harlem at below-market rates while claiming his Washington, D.C., home as his primary residence.

— Failing to fully disclose hundreds of thousands of dollars in other income.