Sen. Alan Peter Cayetano questioned the morality of presidential candidates Sen. Grace Poe and Mar Roxas for allegedly conspiring to bring down Rodrigo Duterte with a negative ad. Video and editing by RYAN LEAGOGO<br /><br />Visit us at http://www.inquirer.net<br />Facebook: http://facebook.com/inquirerdotnet<br />Twitter: http://twitter.com/inquirerdotnet
