Members of President Fidel Ramos' Lakas Party turned on their allies in Congress yesterday, accusing them of obstructing moves to amend the constitution. More than 100 signed a manifesto condemning coalition partners for opposing the formation of a constituent assembly - a move widely seen as intended to extend Mr Ramos' presidency beyond the end of his single six-year term in June. They urged colleagues to declare all committee chairmanships and other positions of power, except that of the House Speaker, Jose de Venecia, vacant. If they get their way, the Lakas deputies will delay the passage of 29 key measures pushed by Mr Ramos, including a law to increase tax collection. At Mr Ramos' request, the House on Wednesday dropped moves to convene into a constituent assembly. The President acted after his predecessor, Corazon Aquino, and the country's leading churchman, Catholic Archbishop Jaime Sin, rejected his request to cancel a mass rally on September 21 against constitutional change. Cardinal Sin's spokesman, Father Ariston Sison, said protests should continue because the battle over constitutional change had merely shifted from Congress to a 'grassroots consultation' beginning next week. Church officials have cancelled all afternoon and evening masses in Manila on September 21, requesting worshippers to attend mass in Rizal Park with Mrs Aquino. President Ramos appealed yesterday to Mrs Aquino's group to join his 'consultations'. Actress Nora Aunor joined the fray, warning Mr Ramos could not be trusted and calling on the film industry to join the protest. She said he never gave her 10-million pesos (HK$2.55 million) he promised after she was named best actress in the 1995 Cairo Film Festival.