The Malawian judge presiding over a legal challenge of Madonna's recent adoption of baby David has postponed a ruling on the case, claiming he is too busy. An alliance of 67 groups is challenging the interim adoption order granted to the singer and her husband Guy Ritchie last month. Madonna denies she used her wealth and influence to speed up the adoption process. Last week Judge Andrew Chipeta in Lilongwe said he would wait till yesterday to decide if the coalition have the legal right to challenge the adoption of the 14-month-old tot, whose biological father Yohane Banda is still alive. However, yesterday's case has been postponed until next week. Justin Dzonzi, lawyer for the groups, says, "The judge has not communicated to me or my colleague but we hear that he is very busy and he might rule next week." Chipeta delayed the case last week after Madonna's local lawyer Alan Chinula said he needed more time to study the groups' arguments.