Khan, who became the first Muslim to head a major Western capital after his victory in 2016, saw off his main challenger, Shaun Bailey, the candidate from Prime Minister Boris Johnson's Conservative Party.
During its first session following the general election, the Lebanese parliament re-elected Hezbollah ally Nahib Berri, who won at least half of the votes, as its speaker.
President Nicolas Maduro faces international condemnation after his re-election in polls that were boycotted by the country's mainstream opposition.
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