National security

This screenshot from CNN's Twitter account shows what CNN says is the explosive device that was delivered to their New York headquarters on Wednesday, Oct. 24, 2018. The package sent to CNN contained a live explosive with wires, a black pipe and an envelope with white powder. Officials said the substance was being tested to see if it was dangerous. (CNN Twitter Account via AP)

U.S. National security adviser John Bolton adjusts his glasses while speaking to the media after his talks with Azerbaijan's President Ilham Aliyev in Baku, Azerbaijan, Wednesday, Oct. 24, 2018. Bolton said that Washington hasn't yet made up its mind on further sanctions against Russia over the poisoning of an ex-Russian spy in Britain. (AP Photo/Aida Sultanova)

FILE - In this June 22, 2018 file photo, President Donald Trump listens during an event on immigration alongside family members affected by crime committed by undocumented immigrants, at the South Court Auditorium on the White House complex in Washington. Federal immigration and health officials were blindsided by President Donald Trump’s “zero tolerance” policy on migrants crossing the southwest border, triggering a cascade of problems as agencies struggled with the fallout from family separations, congressional investigators said in a critical report issued Wednesday. (AP Photo/Evan Vucci)

U.S. National security adviser John Bolton speaks to the media during a news conference in Moscow, Russia, Tuesday, Oct. 23, 2018. (AP Photo/Alexander Zemlianichenko)

Russian President Vladimir Putin, left, and U.S. National security adviser John Bolton during their meeting in the Kremlin in Moscow, Russia, Tuesday, Oct. 23, 2018. (AP Photo/Alexander Zemlianichenko)

U.S. National Security Adviser John Bolton, left, and Russian Foreign Minister Sergey Lavrov shake hands prior to their talks in Moscow, Russia, Monday, Oct. 22, 2018. U.S. President Donald Trump's national security adviser has met with top Russian officials after Trump declared he intended to pull out of a 1987 nuclear weapons treaty. (Russian Foreign Ministry Press Service via AP)

U.S. National Security Adviser John Bolton, left, and Russian Security Council chairman Nikolai Patrushev talk prior their official talks in Moscow, Russia, Monday, Oct. 22, 2018. Bolton met with Patrushev to discuss a broad range of issues including arms control agreements, Syria, Iran, North Korea and the fight against terrorism.(Press Service of the Russian Security Council via AP)

FILE - In this Dec. 8, 1987 file photo U.S. President Ronald Reagan, right, and Soviet leader Mikhail Gorbachev exchange pens during the Intermediate Range Nuclear Forces Treaty signing ceremony in the White House East Room in Washington, D.C. Gorbachev's translator Pavel Palazhchenko stands in the middle. Trump's announcement that the United States would leave the Intermediate-Range Nuclear Forces, or INF, treaty brought sharp criticism on Sunday Oct. 21, 2018, from Russian officials and from former Soviet President Mikhail Gorbachev, who signed the treaty in 1987 with President Ronald Reagan. (AP Photo/Bob Daugherty, File)

FILE - In this Wednesday, June 27, 2018 file photo, U.S. National security adviser John Bolton waits for the talks with Russian President Vladimir Putin in the Kremlin in Moscow, Russia. President Donald Trump’s national security adviser is going to be raising thorny subjects with his counterparts in Moscow on a visit to help craft a script for another high-level meeting between Trump and Russia President Vladimir Putin. John Bolton leaves Saturday, Oct. 20, 2018 on a trip to Russia, Azerbaijan, Armenia and Georgia. (AP Photo/Alexander Zemlianichenko, Pool)