The resignation of Vice President Leni Robredo as housing secretary from President Rodrigo Duterte's Cabinet was long overdue, the camp of former senator Bongbong Marcos said.

In a statement on Monday by Atty. Vic Rodriguez, lawyer of Marcos, the camp said Robredo has “shown her true colors” and that it is none of their business whether Robredo was fired or resigned.

“Her departure from President Duterte's Cabinet is long overdue given her very obvious adversarial attitude and opposite stance from his policies. Whether she was fired or she resigned from her post is definitely not the business of former Senator Bongbong Marcos,” the statement read.

Robredo tendered her resignation letter as secretary of the Housing and Urban Development Coordinating Council on Monday. Duterte accepted the resignation “with a heavy heart” on the same day.

Rodriguez however, said they take “strong exception” on Robredo’s words that she will not allow the vice presidency to be “stolen” from her.

“Such pronouncement is the height of hypocrisy. The vice presidency has indeed been stolen and it was stolen by no less than Mrs. Robredo herself and the political party she continuously supports. It was they who thwarted the will of the Filipino people by depriving them of their real choice for the vice presidency.”

In a speech on Monday afternoon, Robredo said she will guard the presidency against the return of any form of dictatorship, citing that of the Marcos regime.

• READ: Robredo says to guard against dictatorship, defend VP post

Rodriguez claimed that Robredo is “undermining” the the integrity and independence of Presidential Electoral Tribunal by casting doubt this early on.

“Her departure from the Cabinet has nothing to do with the election protest but has everything to do with her political ambition and that of her party’s desperate and despicable act of getting back into power,” he said, alleging that the Liberal Party’s “Plan B” is now in “full swing.”

Robredo won against Marcos in the May vice presidential race with a slim margin.

Marcos has launched an election protest against Robredo on claims of "blatant" and "massive" election fraud.