National Security Adviser John Bolton stands alongside US President Donald Trump as he speaks during a meeting with NATO Secretary General Jens Stoltenberg in the Oval Office of the White House in Washington, DC, May 17, 2018. SAUL LOEB / AFP

John Bolton, Donald Trump's former national security advisor, was indicted Thursday, October 16, by a federal grand jury, the third foe of the US president to be hit with criminal charges in recent weeks. The 76-year-old veteran diplomat has been the subject of a long-running investigation into the handling of classified information.

Asked for his reaction to Bolton's indictment, Trump told reporters at the White House that his former aide is a "bad person."

"I think he's a bad guy," Trump said. "That's the way it goes."

Bolton's indictment follows the recent pressing of criminal charges by the Trump Justice Department against two other prominent critics of the Republican president – New York Attorney General Letitia James and former FBI director James Comey.