Lloyd Blankfein, the former chief executive of Goldman Sachs, took to Twitter on Tuesday to warn Democrats about the dangers of nominating Bernie Sanders as their 2020 presidential candidate.
In his first tweet since November, Blankfein, who endorsed Democratic candidate Hilary Clinton in the run-up to the US presidential election in 2016, tweeted that if Democrats voted for Sanders, "the Russians will have to reconsider who to work for to best screw up the US."
He continued: "Sanders is just as polarizing as Trump AND he'll ruin our economy and doesn't care about our military. If I'm Russian, I go with Sanders this time around."
The tweet came after Sanders won the New Hampshire primary over centrist Pete Buttigieg Tuesday.
Senator Amy Klobuchar emerged as a surprise contender by taking third place, with Elizabeth Warren and Joe Biden finishing in fourth and fifth place.
This is not the first time the two have had a public argument. In the 2016 election, presidential candidate Sanders started a feud with Blankfein after he added him to his "anti-endorsements list," which is a list of wealthy businessmen that Sanders holds up as examples of Wall Street greed.
In a 2016 Bloomberg interview, Sanders accused Blankfein of "making huge amounts of money after destroying the economy," responding to the banker's newly-attained billionaire status.
Blankfein, who retired from Goldman in 2018, responded in a CNBC interview, saying: "To personalize it, it has the potential to be a dangerous moment, not just for Wall Street, not just for the people particularly targets but for anybody who is a little bit out of line."
The former investment banker is a registered Democrat but has previously referred to himself as a "Rockefeller Republican," according to CNBC.