The likelihood of impeaching President Rodrigo Duterte is remote as he remains popular and his allies dominate the lower house of Congress, where all impeachment proceedings have to be filed – but a similar situation did nothing to save former president Joseph Estrada, according to a congressman.“For all other presidents after [Estrada, the threat of impeachment] is like a sword of Damocles hanging over their heads because of what had happened to [him],” Congressman Carlos Isagani Zarate told…