The decision was taken at the meeting of the MPF comprising United Democratic Party (UDP), National People's Party (NPP) and other opposition parties held here on Monday evening.
"We demand that Mukul Sangma should immediately resign and step down from the chief minister's chair," MPF member and UDP working president Paul Lyngdoh told reporters after the meeting here.
According to the MPF, it is due to the "failure and adamant attitude" of the chief minister which has resulted to the massive agitations launched by the pro-ILP activists recently that have crippled normal functioning in the entire state.
NPP leader James Sangma said, "Instead of addressing the issue, the chief minister is camping in New Delhi which clearly shows the insensitive attitude towards the issue".
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"We do not need a visiting chief minister but we want a person, who is in station and resolve the issue in the interest of the people of the state," he said.
According to MPF, Sangma has lost his moral and legal ground to continue as the chief minister of the state.
Notably, the ten pressure groups pressing for implementation of ILP system in the state have called for a four-night road blockade from September 10.
The 7pm to 5am night road blockade will be effective in the 11 districts of the state.