National security

President Donald Trump and Robert O'Brien, just named as the new national security adviser, speak to the media at Los Angeles International Airport, Wednesday, Sept. 18, 2019, in Los Angeles. (AP Photo/Evan Vucci)

FILE - In this May 18, 2017 file photo University of California President Janet Napolitano attends a meeting of the UC Board of Regents in San Francisco. Napolitano has announced she plans to step down in August 2020. The former U.S. secretary of homeland security and Democratic governor of Arizona made the announcement Wednesday, Sept. 18, 2019, at a meeting of the university's Board of Regents. (AP Photo/Eric Risberg, File)

FILE - In this Oct. 11, 2013 file image made from video and released by WikiLeaks, former National Security Agency systems analyst Edward Snowden speaks in Moscow.Former U.S. National Security Agency contractor Edward Snowden, who leaked classified documents detailing government surveillance programs, is calling on French President Emmanuel Macron to grant him asylum. (AP Photo, File)

FILE - In this Feb. 14, 2015, file photo, Edward Snowden appears on a live video feed broadcast from Moscow at an event sponsored by ACLU Hawaii in Honolulu. Snowden has written a memoir, telling his life story in detail for the first time and explaining why he chose to risk his freedom to become perhaps the most famous whistleblower of all time. (AP Photo/Marco Garcia, File)

FILE - In this image from video released by the CIA, Hamza bin Laden, the son of of the late al-Qaida leader Osama bin Laden is seen as an adult at his wedding. The White House says Hamza bin Laden has been killed in a U.S. counterterrorism operation in the Afghanistan-Pakistan region. A White House statement gives no further details, such as when Hamza bin Laden was killed or how the United States confirmed his death. (CIA via AP)

FILE - In this Feb. 14, 2015, file photo, Edward Snowden appears on a live video feed broadcast from Moscow at an event sponsored by ACLU Hawaii in Honolulu. Snowden has written a memoir, telling his life story in detail for the first time and explaining why he chose to risk his freedom to become perhaps the most famous whistleblower of all time. (AP Photo/Marco Garcia, File)

In this photo released by the office of the Iranian Presidency, President Hassan Rouhani speaks in a cabinet meeting in Tehran, Iran, Wednesday, Sept. 4, 2019. Rouhani reiterated a threat that Tehran would take additional steps away from the 2015 nuclear accord on Friday and accelerate its nuclear activities if Europe fails to provide a solution, calling it Iran's third, "most important step" away from the deal. (Iranian Presidency Office via AP)

FILE - In this Nov. 27, 2018 file photo, National security adviser John Bolton speaks to reporters during the daily press briefing in the Brady press briefing room at the White House in Washington. Trump says he fired national security adviser John Bolton, says they 'disagreed strongly' on many issues. (AP Photo/Manuel Balce Ceneta)

FILE - In this April 9, 2018 file photo, President Donald Trump, left, shakes hands with national security adviser John Bolton in the Cabinet Room of the White House in Washington at the start of a meeting with military leaders. Trump has fired national security adviser John Bolton. Trump tweeted Tuesday that he told Bolton Monday night that his services were no longer needed at the White House. (AP Photo/Susan Walsh)

FILE - In this April 18, 2018 file photo, National security adviser John Bolton, left, listens to President Donald Trump, far right, speak during a working lunch with Japanese Prime Minister Shinzo Abe at Trump' s private Mar-a-Lago club in Palm Beach, Fla. Also at the meeting are from left, White House chief economic adviser Larry Kudlow, third left, and Vice President Mike Pence, second left. Trump has fired national security adviser John Bolton. Trump tweeted Tuesday that he told Bolton Monday night that his services were no longer needed at the White House. (AP Photo/Pablo Martinez Monsivais)