(FILES)(COMBO) This combination of file photos created on March 4, 2020 shows US President Donald Trump(L) speaking to the media prior to departing from the White House in Washington, DC, on March 3, 2020, and Democratic presidential hopeful and former Vice President Joe Biden at a Nevada Caucus watch party on February 22, 2020, in Las Vegas, Nevada, during the Nevada caucuses. - Campaign staffs for both President Donald Trump and Democratic rival Joe Biden have been targeted recently by foreign hackers, Google researchers said June 4, 2020, highlighting persistent data security concerns ahead of the November US election. A tweet from Google's threat analysis chief Shane Huntley said the internet giant warned the Biden campaign about "phishing" efforts from China and the Trump campaign from Iran."No sign of compromise. We sent users our govt attack warning and we referred to fed law enforcement," Huntley wrote. (Photos by SAUL LOEB and Ronda Churchill / AFP)