What we know about the undisclosed Trump-Putin dinner encounter

— -- The White House has confirmed that President Donald Trump held a previously undisclosed meeting with Russian President Vladimir Putin at the G-20 in Hamburg, Germany, earlier this month.

Ian Bremmer, an American political scientist and president of the Eurasia Group, previously reported the dinner encounter between Trump and Putin on "Charlie Rose" Monday night, but the White House had not confirmed the encounter until Tuesday evening.

Here's what we know about the conversation between Trump and Putin.

Who was there?

The encounter occurred during "a couples-only social dinner at the G-20," Michael Anton, a senior national security official in the Trump administration, told a small group of reporters Tuesday, a White House official told ABC News. "Toward the end, the president spoke to Putin at the dinner."

The official confirmed that Putin's translator was used during the exchange that occurred toward the end of the three-and-a-half hour dinner.

"During the course of the dinner, all the leaders circulated throughout the room and spoke with one another freely," the official said in part in an extensive statement. "President Trump spoke with many leaders during the course of the evening. As the dinner was concluding, President Trump went over to Mrs. [Melania] Trump, where he spoke briefly with President Putin."

How long was the meeting?

Anton did not reveal the length or content of the meeting, according to a White House official. Anton did not immediately return ABC News' request for comment.

However, despite reports saying it lasted an hour, the official said that Trump and Putin only spoke “briefly.”

Bremmer spoke to ABC News on Tuesday night, saying he stands by the account provided to him by his sources in the room. He said the sources told him Trump got up halfway through the dinner and then went to sit with Putin and the two talked for “about an hour.”

The conversation was said to be “very animated” and jovial in nature, Bremmer said. He added that people in the room “were distressed by what they saw,” and said that it was unusual seeing that type of rapport between an American and Russian president in a talk that lasted as long as it did with just a Russian translator in between them.

What was the White House's response?

In a statement, a White House official disputed the characterization of the meeting as hidden in reports as “false, malicious and absurd.”

"It is not merely perfectly normal, it is part of a president's duties, to interact with world leaders," the official said in the statement. "Throughout the G-20 and in all his other foreign engagements, President Trump has demonstrated American leadership by representing our interests and values on the world stage."

In a series of tweets Tuesday evening, Trump called news coverage of the encounter "sick" and said it was "made to look sinister."

When else did they meet?

Trump and Putin held a high-profile meeting at the G-20 on July 7 that lasted over two hours, in which they discussed in part Russian interference in the U.S. election -- which the Putin denied.

Before the sit-down, the two leaders also had a casual run-in in the morning, where they exchanged a handshake.