PETALING JAYA: The withdrawal of support by Umno MPs for the Perikatan Nasional Federal Government must be backed by statutory declarations (SDs) to the King, say constitutional experts. Constitutional expert Assoc Prof Datuk Dr Shamrahayu Abdul Aziz said that in normal times, an MP will be qualified to become the prime minister when he has the majority support of the MPs in the Dewan Rakyat. “For a leader to remain as prime minister, the requirement is that he must be able to maintain his support among the MPs. “The main issue is how to prove that he has lost confidence (among the MPs). Usually, the practice is by a vote of no confidence in the House. But that is quite impossible at the moment.