PM Syiem, the East Khasi Hills NCP district unit president, tendered his resignation to party leader and Opposition leader Conrad Sangma yesterday.
He resigned from the post protesting the manner in which recent elections were held where the state president of the party, WR Kharlukhi was re-elected, sources said today.
Syiem and his supporters had walked out of the meeting called to elect the party president on February 16.
Although top NCP leaders claim that Kharlukhi was elected unopposed and that there were no contestants for the top post held on February 16, several members were unhappy with the manner in which the election was conducted.