The 92-year-old Mahathir made the remarks today via video conference to a Wall Street Journal event in Tokyo.

He said Anwar, a former enemy turned ally, may just join the Cabinet for a while after his expected release from prison tomorrow.

Mahathir said that he may soon bring a case against former prime minister Najib Razak, who was barred from leaving Malaysia last week after his ruling coalition lost power for the first time in 61 years.

He said he wouldn’t cut a deal with Najib if any wrongdoing was found in a corruption probe into state fund 1MDB.

“We think that within a short while we will have a case against him,” Mahathir said. “We will be able to charge him.”

Mahathir has sought to consolidate power since leading a four-party opposition coalition to a shocking election win last week. Questions over how long he plans to stay on as prime minister risk undermining an agenda that included scrapping a goods-and-services tax, reviewing large infrastructure projects and cutting spending.

“I expect some resistance,” Mahathir said of differences in his coalition government in forming the cabinet. “So far we have been able to resolve. It is accepted that the final decision will be made by me.”

He again pledged to reduce corruption and said he’d stop collecting taxes that are “oppressive.” He said there was currently no need for capital controls, and his government wouldn’t allow any “fiddling” with the value of currencies.

Najib has repeatedly denied wrongdoing after 2015 revelations that around US$700 million, alleged to be 1MDB funds, appeared in his personal accounts before the prior election in 2013.

In 2016, the then-attorney general cleared Najib after saying the money in his account was a “personal donation” from a Saudi royal family member, and most of it was returned. Saudi Arabia said it was a “genuine donation,” without explaining the purpose of the funds.