Afghanistan's Independent Election Commission said initial results based on 10 percent of the vote from 26 out of 34 provinces showed former opposition leader Abdullah Abdullah in the lead with 41.9 percent.
Afghan authorities have received more than 3,000 reports of violations from last weekend's presidential election, exceeding the tally following a 2009 vote that was marred by widespread fraud.
The three frontrunners have all complained of fraud in the April 5 vote mean to usher in Afghanistan's first democratic transfer of power, as Hamid Karzai prepares to step down after more than 12 years as head of state.
"As soon as we get them, it is clear the final number is going to increase," said Nader Mohseni, spokesman for the Independent Election Complaints Commission. He said around half of the 3,103 complaints registered so far would be probed because the rest had lacked the required supporting evidence.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.