I think this is his biggest mistake domestically, to switch the presidential system, because it not only warped decision-making, but also unified his opposition.
As spokesman from Rodrigo Duterte says that as a president, the controversial former mayor would correct what he called the failure of the presidential form of government and move towards a parliamentary system.
I think back to my first tenure as prime minister, and I didn't get on with the president because he wanted to have a kind of presidential system, and I believed in the parliamentary system.