By the numbers
Total value of Ginnie Mae's guarantees for principal and interest on home loans, which has jumped 43 percent in the past two years.
Mortgage lenders, out of more than 300 endorsed by Ginnie Mae, with red flags in their history.
Mortgage lenders that have been cited by various federal regulators for unsafe banking practices, insufficient capital or other violations.
Firms that have default rates on some government-backed loans more than 50 percent higher than the average in their area.