The Iowa attorney general, who is leading the 50-state probe into mortgage foreclosure problems, said on Monday that he hopes to have a settlement with the nation’s biggest banks in the next two months. U.S. regulators and a coalition of state attorneys general are negotiating with the biggest mortgage lenders, including Bank of America Corp., JPMorgan Chase & Co., Citigroup Inc. and Wells Fargo & Co. The probe is the result of problems that burst into public view last year of banks taking possibly illegal shortcuts in some foreclosure proceedings, such as using “robo-signers” to sign hundreds of unread documents a day.