San Francisco, Jul 22 (IANS): Facebook has started labelling controversial posts from US President Donald Trump and Democratic presidential candidate Joe Biden about voting as election inches closer.

The social network flagged a Trump post that claimed current rules on postal votes could lead to a "corrupt" election, reports the BBC,

The social network has also labelled several posts from Biden on voting.

Facebook CEO Mark Zuckerberg last month said that they will start labeling some of the content they leave up because it is deemed newsworthy in the US election year.

"We'll add a prompt to tell people that the content they're sharing may violate our policies. Similarly, there are no exceptions for politicians," he said.

"Even if a politician or government official says it, if we determine that content may lead to violence or deprive people of their right to vote, we will take that content down".

Twitter began labelling some of the Trump's tweets in May.

Meanwhile, Zuckerberg has stressed there is ‘no deal of any kind' with Trump.

He told Axios: "I've heard this speculation, too, so let me be clear: There's no deal of any kind. Actually, the whole idea of a deal is pretty ridiculous".