Trump Jr shakes up Wall St

The Dow Jones Industrial Average erased about 160 points in 20 minutes as Donald Trump Jr released emails from last year. Photo / AP

Wall Street was mixed, recovering from an earlier decline amid fresh concerns about ties between President Donald Trump's administration and Russia.

The Dow Jones Industrial Average erased about 160 points in 20 minutes and volume in the most widely traded S&P 500 futures tripled, according to Bloomberg, as Donald Trump Jr released emails from last year showing he welcomed the fact that a Russian prosecutor offered information that would "incriminate" Hillary Clinton and "would be very useful to your father" as "part of Russia and its government's support for Mr Trump."

In 3.23pm trading in New York, the Dow Jones Industrial Average added 0.09 per cent, while the Nasdaq Composite Index rose 0.31 per cent. In 3.08pm trading, the Standard & Poor's 500 Index slipped 0.07 per cent.

"I think people are worried that it just means more political uncertainty, and sort of a continuation of the stalemate in Washington, a continuation of the delay in trying to get the Trump agenda passed through Congress," Robert Pavlik, chief market strategist at Boston Private Wealth in New York, told Reuters.

US Treasuries advanced, pushing yields on the 10-year note one basis point lower to 2.36 per cent, while the greenback weakened.

Also, Federal Reserve Chair Janet Yellen is set to deliver her semiannual testimony to Congress, speaking before the House Financial Services Committee on Wednesday and before the Senate Banking Committee on Thursday.

"The semi-annual monetary policy testimony has often been a big deal for the markets," Scott Brown, chief economist at Raymond James in St Petersburg, Florida, told Reuters. "I think there may be some fears that she's going to come out relatively hawkish."

The Dow inched higher as gains in shares of General Electric and those of Boeing, recently up 1.2 per cent and 1.1 per cent respectively, outweighed falls in shares of Nike and those of Pfizer, recently 0.9 per cent and 0.8 per cent weaker respectively.

Shares of Snap dropped, trading 8.6 percent weaker at US$15.53 as of 3.23pm in New York, after Morgan Stanley downgraded its rating on the stock as well as its price target, cutting the latter from US$28 to US$16. Morgan Stanley was the lead underwriter for Snap's initial public offering earlier this year.

"We have been wrong about Snap's ability to innovate and improve its ad product this year (improving scalability, targeting, measurability, etc.) and user monetisation," Morgan Stanley analyst Brian Nowak wrote in a note, according to media reports. "Snap's ad product is not evolving/improving as quickly as we expected and Instagram competition is increasing."

In Europe, the Stoxx 600 Index ended the session with a 0.7 per cent drop from the previous close. The UK's FTSE 100 Index fell 0.6 per cent, France's CAC40 Index slid 0.5 per cent, while Germany's DAX Index slipped 0.1 per cent.