US President Donald Trump took to Twitter to blast the suggestion that there was anything improper about his dinner chat with Russian President Vladimir Putin during the Group of 20 (G-20) summit in Hamburg, Germany.

The revelation that Mr Trump and Mr Putin met for a second time during the summit, and spoke for an hour on July 7 with only a Russian translator listening, sparked a war on Twitter between the US President and Eurasia Group founder and geopolitical analyst Ian Bremmer, who first tweeted about the meeting.

Here is a look at the exchange on the social media site:

@ianbremmer: Trump met with Putin a second time? Yes. I discuss on

@CharlieRose. @ianbremmer: Trump administration had no intention of disclosing second hour-long meeting w Putin.

@ianbremmer: Readout from Trump admin on what was/wasn't discussed in official meeting w Putin useless when there was 1 hour convo off books that eve.

@realDonaldTrump: Fake News story of secret dinner with Putin is "sick". All G-20 leaders, and spouses, were invited by the Chancellor of Germany. Press knew!

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

@ianbremmer: Press didn't know you spent an hour during dinner in 1-1 discussion w Putin (& his translator). Other G-20 leaders found it... unusual.

@ianbremmer: President Trump, can you share with us what you discussed with Putin?

@ianbremmer: Fake News? I don't think so. The 2nd Trump-Putin discussion, from last night on @maddow.