"Wow, even the pumpkins are white," one Twitter user wrote.
The account was earlier accused of spreading propaganda, conspiracy theories and running campaigns against Pakistani journalists and activists who are critical of the government.
The incident triggered a fierce meme battle, with people creatively doctoring pictures of Trump's water sip in various ways.
"Today's lesson from the White House, kids: Never apologize or take responsibility for your actions," one Twitter user wrote.
"Nobel Peace Prize is now a contest between Pentagon retweeter and Twitter Trump account deleter," one Twitter user wrote.
Vitaly Bespalov said IRA employees working in the "American department" were paid about $1,300 to $2000 per month to create inflammatory content.
"The only way this could be worse would be if Linton and Mnuchin were lighting cigars with flaming dollar bills," one Twitter user wrote.
One Twitter user wrote: "Marco Rubio only used one hand to hold the waterbottle. Trump looked like he was drinking from a sippy cup."
McNamee has called on Facebook to contact every person who was exposed to the Russian-bought ads during the 2016 election.
"The truth has never been his strong suit," one Twitter user wrote.
"The fact that the U.S. president can't even keep track of all the mass shootings is a fairly compelling argument for gun reform," one Twitter user wrote.
"Nobody trolls Current Trump better than Past Trump," one Twitter user wrote.
Julian Assange took to Twitter to respond to the "alleged" messages, claiming that he could not confirm them and that WikiLeaks "did not keep such records".
The revelation comes as the UK parliament launches its own investigation into Russian interference in British politics and the Brexit vote.
The former FBI director tweeted about truth, lies and justice in what many took as a subtweet to the US president's recent criticism.