President Donald Trump's oldest son on Monday released a series of private Twitter exchanges between himself and WikiLeaks during and after the 2016 election, including pleas from the website to publicise its leaks.

Donald Trump Jr.'s release of the messages on Twitter came hours after The Atlantic first reported them. In the exchanges - some of them around the time that the website was releasing the stolen emails from Democrat Hillary Clinton's campaign chairman - WikiLeaks praises his father's positive comments about the website and asks Mr Trump Jr. to release his father's tax returns to the site.

The revelations are expected to increase calls in Congress to have Mr Trump Jr. testify publicly as part of several committee probes into Russian interference in the 2016 election. And they add a new element to the investigations that have been probing for months whether Mr Trump's campaign colluded in any way with the Russian government.

In an intelligence assessment released last January, the NSA, CIA and FBI concluded that Russian military intelligence provided hacked information from the DNC and "senior Democratic officials" to WikiLeaks. WikiLeaks has denied that Russia was the source of emails it released, including those from Clinton's campaign chairman, John Podesta.