CHENNAI, June 13 -- Tamil Nadu Assembly speaker J C D Prabhakar on Friday said a showcause notice seeking an explanation has been issued to four former AIADMK MLAs who joined the ruling Tamilaga Vettri Kazhagam (TVK).

The four legislators - S Jayakumar (Perundurai), K Maragadham Kumaravel (Madurantakam), Sathya Bama (Dharapuram) and Isakki Subaya (Ambasamudram) - were among the 25 AIADMK MLAs who voted in favour of the ruling TVK during the crucial trust vote held on May 13.

The four legislators later resigned as MLAs on May 25 and formally joined the TVK in the presence of senior party leaders, including general secretaries N Anand and Aadhav Arjuna, at the Secretariat.

The speaker said that while 21 of the rebel AIADMK legislators ha...