SIOUX FALLS, S.D. (AP) — Billionaire banker and philanthropist T. Denny Sanford plans to ask the South Dakota Supreme Court to bar the release of affidavits used to issue search warrants into a child pornography investigation. The notice came after Judge James Power refused to first release the affidavits to Sanford’s legal team before they became public. Sanford attorney Stacy Hegge argued they couldn’t evaluate whether to appeal unless they reviewed the documents. The Sioux Falls Argus Leader and ProPublica have been working to get the documents for two years. After Sanford’s lawyers said they would meet Monday’s deadline to appeal, Power said he would keep the documents sealed until Sanford has exhausted all appeals. He has not been charged. The 86-year-old Sanford is worth an estimated $3.4 billion.