Weapons of mass destruction

FILE - In this Friday, March 16, 2018 file photo, Britain's Foreign Secretary Boris Johnson speaks at a joint press conference with the Polish Foreign Minister Jacek Czaputowicz during a visit to the Battle of Britain Bunker, in Uxbridge, England. Britain’s foreign secretary said Sunday, March 18, 2018 that the trail of blame for the poisoning of a former spy “leads inexorably to the Kremlin,” after a Russian envoy suggested the nerve agent involved could have come from a U.K. lab. (Tolga Akmen/Pool Photo via AP, File)

FILE - In this Friday, March 16, 2018 file photo, Britain's Foreign Secretary Boris Johnson speaks at a joint press conference with the Polish Foreign Minister Jacek Czaputowicz during a visit to the Battle of Britain Bunker, in Uxbridge, England. Britain’s foreign secretary said Sunday, March 18, 2018 that the trail of blame for the poisoning of a former spy “leads inexorably to the Kremlin,” after a Russian envoy suggested the nerve agent involved could have come from a U.K. lab. (Tolga Akmen/Pool Photo via AP, File)

People walk passed the British Consulate General, in St.Petersburg, Russia, Saturday, March 17, 2018. Russia on Saturday announced it is expelling 23 British diplomats and threatened further measures in retaliation in a growing diplomatic dispute over a nerve agent attack on a former spy in Britain. (AP Photo/Dmitri Lovetsky)

People walk passed the British Consulate General, in St.Petersburg, Russia, Saturday, March 17, 2018. Russia on Saturday announced it is expelling 23 British diplomats and threatened further measures in retaliation in a growing diplomatic dispute over a nerve agent attack on a former spy in Britain. (AP Photo/Dmitri Lovetsky)

People walk passed the British Consulate General, in St.Petersburg, Russia, Saturday, March 17, 2018. Russia on Saturday announced it is expelling 23 British diplomats and threatened further measures in retaliation in a growing diplomatic dispute over a nerve agent attack on a former spy in Britain. (AP Photo/Dmitri Lovetsky)

Australian Prime Minister Malcolm Turnbull makes an opening speech at the Leaders Plenary during ASEAN-Australia Special Summit, Sunday, March 18, 2018, in Sydney, Australia. It is the first time Australia has hosted the summit with ASEAN leaders in Australia. (Mark Metcalfe/Pool via AP)

British ambassador to Russia, Laurie Bristow, arrives for a meeting at the Russian foreign ministry building in Moscow, Russia, Saturday, March 17, 2018. Russia's Foreign Ministry has summoned Bristow for talks in a heightening dispute over a nerve agent attack on a former spy in Britain. Russia is expected to announce the expulsion of some British diplomats in a retaliatory measure. (AP Photo/Pavel Golovkin)

British ambassador to Russia, Laurie Bristow, leaves after a meeting at the Russian foreign ministry building in Moscow, Russia, Saturday, March 17, 2018. Russia's Foreign Ministry has summoned Bristow for talks in a heightening dispute over a nerve agent attack on a former spy in Britain. Russia is expected to announce the expulsion of some British diplomats in a retaliatory measure. (AP Photo/Pavel Golovkin)

This photo released by the Syrian official news agency SANA, shows Syrian civilians with their belongings as they flee from fighting between the Syrian government forces and rebels, near Hamouria in eastern Ghouta, a suburb of Damascus, Syria, Friday, March. 16, 2018. The government offensive has pushed further into eastern Ghouta, chipping away at one of the largest and most significant opposition bastions since the early days of the rebellion, communities where some 400,000 people are estimated to be holed up. (SANA via AP)

FILE - This Oct. 14, 2016 photo provided by the Sedgwick County Sheriff's Office shows Gavin Wright. Wright is one of three members of a militia group are set to stand trial on charges alleging they were plotting to bomb a mosque and a southwestern Kansas apartment complex IN 2016 where Somali refugees live. Wright, Eugene Stein. and Curtis Allen have pleaded not guilty to charges including conspiracy to use a weapon of mass destruction. Their trial is scheduled to start Tuesday, March 20, 2017 in Wichita. (Sedgwick County Sheriff's Office via AP File)