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LONDON, ENGLAND - MAY 23:  The Union flag flies at half mast in Downing Street on May 23, 2017 in London, England. Prime Minister Theresa May has held a COBRA meeting this morning following a suicide attack at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed the explosion as a terrorist attack with 22 fatalities and 59 injured.  (Photo by Carl Court/Getty Images)
LONDON, ENGLAND - MAY 23:  The Union flag flies at half mast in Downing Street on May 23, 2017 in London, England. Prime Minister Theresa May has held a COBRA meeting this morning following a suicide attack at Manchester Arena as concert goers were leaving the venue after Ariana Grande had performed. Greater Manchester Police have confirmed the explosion as a terrorist attack with 22 fatalities and 59 injured.  (Photo by Carl Court/Getty Images)

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    Homeland Sec. Chair: U.S. needs to remain vigilant

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Homeland Sec. Chair: U.S. needs to remain vigilant

Senator Ron Johnson, Chair of the Senate Homeland Security Committee, speaks with CNN's Jake Tapper following the terror attack at a UK concert.

Homeland Sec. Chair: U.S. needs to remain vigilant

Senator Ron Johnson, Chair of the Senate Homeland Security Committee, speaks with CNN's Jake Tapper following the terror attack at a UK concert.