US President Donald Trump has accused Democrats without evidence of trying to steal Tuesday's US election as the result hangs in the balance.
His Democratic challenger Joe Biden earlier appealed for calm as the nail-biting count drags on in five states.
While clinging to his edge in Nevada and Arizona, Mr Biden has been chewing into the Republican president's lead in Pennsylvania and Georgia.
It follows one of the most rancorous presidential races in living memory, reports BBC.
What did Trump say?
In his first public remarks since appearing at the White House in the early hours of Wednesday, the president said: "If you count the legal votes, I easily win.
"If you count the illegal votes they can try to steal the election from us."
Beyond allegations of irregularities, the Trump campaign has not presented any evidence of election fraud.
Speaking from the White House on Thursday, the president added: "We were winning in all the key locations, by a lot actually, and then our numbers started getting miraculously whittled away in secret and they wouldn't allow legally permissible observers."
Mr Trump's critics have pointed out his lead is being cut into because he actively discouraged his supporters from voting by mail, while Mr Biden urged his voters to use postal ballots, and it is these votes that are now being tallied in the key states.
The president added: "There's been a lot of shenanigans and we can't stand for that in our country."
What did Biden say?
Earlier on Thursday, speaking from his campaign headquarters in Wilmington, Delaware, Mr Biden appealed for calm across the country.
In a brief televised address, the Democratic challenger again expressed confidence he would be declared the winner.
"Democracy is sometimes messy," he said. "It sometimes requires a little patience as well.
But that patience has been rewarded now for more than 240 years, the system of governance that has been the envy of the world."
He added: "I asked everyone to stay calm. All people to stay calm. The process is working. The count is being completed. And we'll know very soon."
As results gradually trickle in, protests involving both sides have been held in major cities over the vote counting.