A foreign state actor has hacked a parliamentarian and three staff members' WhatsApp accounts, leading to the platform being temporarily blocked.A Department of Parliamentary Services official told a Senate hearing today there was a "targeted phishing activity" on March 6.They received reports from a parliamentarian and three staffers that their accounts had been compromised.READ MORE: 'Maybe today': Rubio hints US-Iran deal could come sooner than we thinkAn MP's WhatsPApp account was hacked into by a foreign state actor.