Khan's predecessors Ken Livingstone and Boris Johnson served two terms as mayor of London.
"The comparison is grossly offensive and inaccurate, and it is also stupid," the chief executive of the Antisemitism Policy Trust said.
The prime minister told the nation that he left the transport system with a "very considerable sum of money".
Suits you, Sir? The Labour leader’s culture war challenge
Once considered a front-runner for general secretary, she’ll now work as senior adviser.
Shadow Brexit secretary gives big job to former party campaigns chief and Ken Livingstone aide
The five things you need to know about politics today
Victim-blaming, denialism, and character assassination could not be further from the response the Jewish community are crying out for, Labour campaigner Joshua Garfield writes
A 13-point action plan, leaked to HuffPost UK, backs anonymised complaints, strict deadlines
Sky News Reporter Quoted 'The Daily Mash' When Wrongly Claiming Ken Livingstone Has Pet Newt Called 'Adolf'
Yep, the satirical website.