Metro Manila (CNN Philippines) — As far as Rodrigo Duterte is concerned, Vice President Jejomar Binay is a talented person who could end up continuing his corrupt ways if elected president.

On the sidelines of his campaign sorties in Pasay where he met with shipping industry members, a religious group and health professionals, Duterte said corruption could just get worse under a Binay presidency.

"Maybe. Marami siyang kaso eh. Ang problema eh baka ituloy niya yung laro niya," he said.

[Translation: Maybe. He has many cases. The problem is he might continue his corrupt ways.]

The mayor sees another problem under a Binay presidency, the president will just end up being busy defending himself from various corruption allegations.

Binay is again on the spotlight following a Commission on Audit report recommending that he be punished with removal from office, fines and imprisonment because of a wide array of offenses from grave misconduct to graft and corrupt practices.

Related: COA report proves Binay not worthy of presidency, says Roxas

Duterte said the Office of the Ombudsman could hold Binay administratively liable.

"Administratively baka. Baka. The Ombudsman is equipped with powers really to impose disciplinary actions," he said.

[Translation: Maybe administratively. Maybe. The Ombudsman is equipped with powers really to impose disciplinary actions.]

But could Binay be removed from office?

Duterte said it would still have to be done through impeachment, but there's enough time for that now.

His running mate, Sen. Alan Peter Cayetano, said insofar as he's concerned, Binay is not immune from suit as vice president.

"If you look at the U.S. Constitution na ginaya ng Philippine Constitution, ang immunity nasa president lang. Other impeachable officers, walang immunity," said Cayetano.

[Translation: If you look at the U.S. Constitution which the Philippine Constitution copied, only the president has immunity. Other impeachable officers don't have immunity.]

Now Cayetano has a challenge to the vice president - if he doesn't want to defend himself before Ombudsman or the court, Binay should once and for all explain to the people-through media, his alleged properties and billion of pesos stashed in various bank accounts.

The tandem was also asked about their political ads.

A report from the Philippine Center for Investigative Journalism (PCIJ) shows Duterte has spent over a million pesos since December.

Related: Presidential, VP bets spend P6.7 billion on pre-election campaign ads - PCIJ

Duterte said he doesn't know who paid for the ads.

He said a Chinese businessman who refused to be identified paid for the ads which he would have declined had he been told about it.

Duterte stressed as well that he is not funded by any mining operator, as claimed by an opponent's camp.