Stock futures declined on Thursday as more details came to light in the investigation over the Trump campaign's ties to Russia. 

S&P 500 futures were down 0.22%, Dow Jones Industrial Average futures fell 0.3%, and Nasdaq futures slid 0.2%.

A report from Reuters said former National Security Adviser Michael Flynn and others in Donald Trump's presidential campaign had extensive contacts with Russian officials. According to Reuters sources, Flynn and others on Trump's team made contact with contacts associated with the Kremlin at least 18 times over the final seven months of the election.  

The revelation follows news Wednesday that the U.S. Department of Justice named former FBI Director Robert S. Mueller to head a probe into allegations that Russia interfered in last year's presidential elections and any ties between the Trump campaign and Moscow.

The latest report follows on from a turbulent week for Trump and his team. On late Tuesday, a New York Times report found that Trump asked former FBI Director James Comey to shut down the federal investigation into since-ousted National Security Adviser Michael Flynn. Flynn was forced to resign on Feb. 13 amid questions over his contact with the Russian ambassador and discussions of U.S. sanctions.

Comey wrote a memo detailing his conversation with the president shortly after it took place, according to the Times, which cited two people who read the document. It's part of a paper trail Comey created documenting what he believed to be improper efforts to influence the investigation. The president fired Comey, who was heading an investigation into the Trump campaign's alleged ties with Russia, early last week.

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