Robert McBride has told the state capture inquiry corruption-busting entities were being wiped out during his tenure.
"He's willing to use processes to achieve his ends," McBride testified.
The former Ipid head also criticised the media over a leaked report on the police watchdog.
McBride cited a Sunday Times article on a law firm's investigation into Ipid.
The probe, commissioned by the then-police minister, was over the extradition of Zimbabwean suspects.
Nhleko hasn't yet applied to cross-examine McBride.
The former Ipid boss will return to the stand on Monday.