A court’s decision to keep former Malaysian leader Najib Razak behind bars has reopened fault lines between Prime Minister Anwar Ibrahim’s ruling coalition and Umno, the country’s once-dominant ruling party. The Kuala Lumpur High Court on Monday rejected Najib’s application to serve the remainder of his prison sentence under house arrest, ruling that a purported addendum to a royal clemency order “had no legal effect because it was never deliberated by the Pardons Board”.