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(FILES) This file photo taken on March 23, 2017 shows Mayor of London Sadiq Khan speaks during a vigil in Trafalgar Square in central London on March 23, 2017 in solidarity with the victims of the March 22 terror attack at the British parliament and on Westminster Bridge. 
Donald Trump lashed out Sunday at London's mayor Sadiq Khan, accusing him of downplaying the threat of terrorism a day after knife-wielding men mowed down and stabbed revelers in the British capital. London's mayor swiftly shot down the US president's remarks, made in a series of overnight tweets, as critics accused Trump of exploiting a terror attack for political gain -- and not for the first time.
 / AFP PHOTO / LEON NEALLEON NEAL/AFP/Getty Images
(FILES) This file photo taken on March 23, 2017 shows Mayor of London Sadiq Khan speaks during a vigil in Trafalgar Square in central London on March 23, 2017 in solidarity with the victims of the March 22 terror attack at the British parliament and on Westminster Bridge. 
Donald Trump lashed out Sunday at London's mayor Sadiq Khan, accusing him of downplaying the threat of terrorism a day after knife-wielding men mowed down and stabbed revelers in the British capital. London's mayor swiftly shot down the US president's remarks, made in a series of overnight tweets, as critics accused Trump of exploiting a terror attack for political gain -- and not for the first time.
 / AFP PHOTO / LEON NEALLEON NEAL/AFP/Getty Images

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London Mayor Sadiq Khan responds to a vehicle attack on worshipers at a London mosque, promising increased police protection for upcoming Muslim holidays.