What Tun Dr. Mahathir did to Najib after GE14 Elections?

It's the old vintage Dr. Mahathir.

MAY 2018

13 May - Najib under 'house arrest'.
 Bernama news :- Police began cordoning off the exit to and from the private residence of former prime minister Datuk Seri Najib Tun Razak at Jalan Langgak Duta, Taman Duta here Sunday (May 13). 

Sentul deputy police chief Supt Mohamed Rafiq Mohamed Mustafa, when contacted by Bernama, said policemen from the Sentul police station had been stationed there to monitor security.  

A check by Bernama saw five policemen stationed at the entrance to Najib's residence.  

There was also a mobile police station, and all vehicles and individuals passing the area were inspected.  

Media practitioners, who had been camping there, were not allowed into the area. 

- Bernama

Accessed at : https://www.thestar.com.my/news/nation/2018/05/13/police-cordon-off-entrance-to-najib-private-residence-in-taman-duta/