joseph emilio "jun" aguinaldo abaya (born may 28, 1966) is a filipino politician, lawyer, and military officer. he was the secretary of the department of transportation and communications (dotc) of the philippines under the administration of president benigno aquino iii. a member of the liberal party, he has been elected to three terms as a member of the philippine house of representatives, representing the 1st district of cavite. he first won election to the house in 2004, and was re-elected in 2007. he and other aquino administration officials have been charged over the alleged anomalous contracts for the metro rail transit line 3 (mrt3) during their time.