Fannie Mae, operating under a federal conservatorship, asked the US Treasury for a $19bn capital investment and raised the possibility that its long-term survival may be dependent on continued government funding.

Fannie Mae, which took $15.2bn in aid on 31 March, cited the 'unprecedented' housing market slump and government- mandated programs that are creating 'conflicts in strategic and day-to-day decision making,' according to company filings today with the Securities and Exchange Commission.