The meeting is expected to happen on the sidelines of a larger event, the World Meeting on Human Fraternity, attended by Nobel laureates, artists, athletes and other politicians.
Mr. Khan defeated a right-wing rival who focused on crime and cars, his victory another ominous sign for Britain’s ruling Conservatives ahead of a general election.
Voters in England and Wales will choose local officials on Thursday. The results could demonstrate whether the governing party’s dire poll ratings are reliable, analysts say.