Malaysia' s new prime minister Mahathir Mohamad has wasted no time in setting the wheels of change moving after being sworn in Thursday night. In Wednesday's general election, the Pakatan Harapan alliance led by Mahathir soundly defeated the party and alliance that had ruled the country for six decades, and ousted Najib Razak as the country's leader. The 92-year-old who had led Malaysia for 22 years before, is quickly laying out his alliance's agenda for change, and some of it will worry Najib, as Rian Maelzer reports from Kuala Lumpur.

RIAN MAELZER KUALA LUMPUR "The new ruling alliance of Malaysia and its leader Mahathir Mohamad are promising lean, clean government, and also one that will remain strongly supportive of free trade and good bilateral relations with all countries."

Since his swearing in as prime minister Thursday night, the indefatigable Mahathir has held two press conferences.

Mahathir has said that the new government will follow through on its pledge to abolish the unpopular goods and services tax.

And on Wednesday, he revealed the king has confirmed that he will swiftly grant a pardon for former deputy prime minister Anwar Ibrahim, the leader of the largest party in the now-ruling alliance. Anwar is serving the tail end of a prison sentence on sexual charges. His supporters say were politically motivated.

MAHATHIR MOHAMAD MALAYSIAN PRIME MINISTER "It is going to be a full pardon, which of course means that he should not only be pardoned, he should be released when he is pardoned and after that he will be free to participate fully in politics."

Meanwhile, former prime minister Najib Razak can expect a new investigation into the role he's alleged to have played in the misappropriation of billions of dollars from state investment firm 1MDB.

AZMI SHAROM, LAW PROFESSOR UNIVERSITY OF MALAYA "Firstly, they have to change things within the system, within the institutions. You need a new attorney general. You'd also probably need a new head of the anti-corruption agency. Once those changes in personnel have occurred then the investigation can be properly opened."

And Mahathir has already indicated such changes are on the cards, accusing the attorney general Wednesday of covering up for Najib.

RIAN MAELZER KUALA LUMPUR "Malaysians are marveling at the rapid changes taking place. And there is a huge sense of relief if not euphoria that this unprecedented transition of power has no only happened so swiftly, but entirely peacefully as well. RM, CGTN, KL."