MANILA, Philippines – The Senate security unit is assessing and preparing appropriate arrangements for the impeachment trial of Vice President Sara Duterte, Senate Sergeant-at-Arms Ret. PMGen. Alfred Sotto-Corpus said on Monday. Corpus was asked about the possible security arrangements during the impeachment trial itself, even as the Senate continues to be on “heightened alert” while the pre-trial conference is ongoing. “It depends… We will rea…