Former senator Ferdinand “Bongbong” Marcos Jr. and President Rodrigo Duterte. File/Composite

Former senator Ferdinand "Bongbong" Marcos Jr. on Wednesday said he is open to joining the Duterte Cabinet but showed no signs of letting go of his electoral protest against Vice-President Leni Robredo.

"If the President asks you to serve in whatever capacity hindi mo pupuwedeng tanggihan. Siyempre para sa bansa yan and of course I'd be happy, I'd be proud, I'd be honored to serve in any position in the Duterte administration," Marcos said in an interview.

He added: "I have not spoken to the President for a...few weeks now so, and never pa namin napag-usapan ang kahit na anong klaseng appointment."

Marcos was the rumored choice of Duterte to be Department of the Interior and Local Government Secretary even before Ismael Sueno was dismissed Tuesday.

Duterte earlier refuted news reports that Marcos would get the key Cabinet post. "He’s not interested,” the President said.

Marcos said he does not believe joining the Cabinet will jeopardize his electoral protest after losing the May 2016 vice-presidential election. Marcos lost to Robredo by only around 200,000 votes.

"Depends on the position. I guess I'll leave that to the lawyers to study pero pagkaalam ko it is only during an election that you are abandoning," he said.

The former senator also took a swipe at Vice-President Robredo during former President Gloria Arroyo's 70th birthday celebration in Lubao, Pampanga.

During his speech, Marcos apologized to cabalens whose votes he claimed were not counted. Marcos won in the province but lost to Robredo, a defeat he is protesting before the Presidential Electoral Tribunal.

"Napakaganda po ng resulta ko dito, di lamang sa Lubao kundi sa buong lalawigan ng Pampanga. Kaya po ako'y nagpapasalamat sa inyo at hihingi ng inyong paumanhin na ang ilan sa inyong boto ay di nabilang pero asahan po ninyo hindi po natin titigilan hanggang lahat ng bawat boto na binoto niya sa akin ay mabibilang at palalabasin po natin yan," he said.

In an ambush interview, Marcos also weighed in on the possible impeachment complaint that may be filed against Robredo before the Lower House because of her criticism of President Duterte's war on drugs before the UN.

"At the very least she was unpatriotic and disloyal to the Philippines but it is a matter of opinion whether she should be impeached," he said.

Robredo's critics are looking at invoking the ground of betrayal of public trust in seeking her ouster.