After a brief greeting at the start of the two-day summit and a two-hour bilateral meeting with their foreign ministers on July 7, Trump and Putin also chatted over dinner on the final night of the summit, an official said.

"There was a couples-only social dinner at the G20," a White House official told AFP. "Toward the end, the president spoke to Putin at the dinner."

The disclosure has raised questions about what the pair talked about, who was present and why the meeting was not previously mentioned.

The Trump administration has been besieged by allegations that the president's closest advisors colluded with Russia to win the 2016 election.

Trump's eldest son Donald Jr recently released emails showing he held a meeting during the campaign with Kremlin-connected figures, hoping to get dirt on his dad's election rival Hillary Clinton.

Trump late Tuesday took to Twitter to blast the suggestion that there was anything improper about his dinner chat with Putin.

"Fake News story of secret dinner with Putin is 'sick.' All G20 leaders, and spouses, were invited by the Chancellor of Germany. Press knew!" he declared.

"The Fake News is becoming more and more dishonest! Even a dinner arranged for top 20 leaders in Germany is made to look sinister!"

A second White House official denied there was a "second meeting" between Trump and Putin, describing a "brief conversation at the end of a dinner." 

"The insinuation that the White House has tried to 'hide' a second meeting is false, malicious and absurd," the official said.

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