Richard Holbrooke raised concerns about ballot-stuffing and fraud, by a number of candidates' teams, sources say.
The US envoy also said a second-round run-off could make the election process more credible, the sources said.
Even if there is an alleged "second round", the Afghans and the world know that these elections were simply a sham; large swathes of potential candidates were banned from even being on the ballot.
It's just a question as to which of Washington's puppets will be installed as President to do precisely as his masters order him to do. There is no legitimacy to this process whatsoever.