The president of Malaysia’s Umno has denied abandoning disgraced ex-prime minister Najib Razak to save himself, as fissures emerge in the former ruling party over the mixed legal fortunes of two of its top leaders.Umno grass-roots members have urged President Ahmad Zahid Hamidi to quit Prime Minister Anwar Ibrahim’s government in protest after the High Court blocked Najib’s bid to serve the remainder of his jail term under house arrest last month. It also handed the one-time party figurehead a...