Johannesburg - The Democratic Alliance will on Monday ask the SA Revenue Service to investigate ANC Youth League leader Julius Malema's finances, the party's police spokesperson Dianne Kohler Barnard said.MP Kohler Barnard said the move has been prompted by reports that Malema is building a R16m mansion in the wealthy Johannesburg suburb of Sandown."I will be writing a letter asking for an investigation into his finances. The time has come. It is inconceivable that someone who claims to live on a R25 000 salary from one of the ANC bodies can get a bank loan for R16m."One needs an investigation into where the money is coming from. If someone is handing out money to him we need to know who it is."The Sunday Independent reported that Malema had torn down a house on a plot he bought in Sandown in 2009 and was building a modern new multi-storey home with a party deck and a secure basement where he could take refuge from attack.Kohler Barnard said if reports of "an underground bunker" were true it showed that Malema had no confidence in government's efforts to fight crime.The ANC Youth League has refused to comment on reports of Malema's new house.The DA also called for an investigation into Malema earlier this year, when reports surfaced that lucrative government tenders in Limpopo were awarded to companies linked to him.