Mahathir Mohamad says Malaysia is "controlled by thieves".
The former prime minister is accusing his latest successor of stealing public money - lots of it.
So do thousands of protesters.
They defied a police ban in the capital Kuala Lumpur to demand the resignation of Najib Razak.
The prime minister denies stealing money pumped into a multibillion dollar government investment fund by foreign investors.
The long-running corruption scandal has given rise to a campaign to clean up government.
The political reform campaign is called Bersih – the Malay word for clean.
What now for one of Asia's most prosperous countries?
Presenter: Martine Dennis.
Marina Mahathir, daughter of former prime minister Mohamad Mahathir.
Michael Vatikiotis, Centre for Humanitarian Dialogue.
Ei Sun Oh, former aide to Malaysian Prime Minister Najib Razak.
Source: Al Jazeera News