The Democratic Party in the US has filed a lawsuit against Russia, President Donald Trump's campaign and WikiLeaks, charging that they conspired to disrupt the 2016 US presidential election.

The party alleges in the federal lawsuit in Manhattan that top Trump campaign officials conspired with the Russian government and its military spy agency to hurt Democratic presidential nominee Hillary Clinton and influence the election for Mr Trump by hacking Democratic Party computers.

The lawsuit alleges that the Trump campaign "gleefully welcomed Russia's help" in the election and accuses the Trump campaign of being a "racketeering enterprise".

Four US intelligence agencies reported last year that Russia sponsored the hacking of Democratic Party groups and other actions during the 2016 campaign.

Part of the effort was to benefit Mr Trump over Mrs Clinton, the agencies said.

The Democratic National Committee blames Russia for breaches of its computer systems in 2015 and the first half of 2016.

Hackers disseminated internal communications of party officials as the Democratic nominating convention got under way, and WikiLeaks released thousands of emails, some of which were embarrassing for the Clinton campaign.

The lawsuit names Donald Trump Jr, Trump associate Roger Stone and Mr Trump's son-in-law, Jared Kushner, as defendants.

Most of the accusations appeared to be based on news reports and publicly available legal documents and offered little new information about alleged collusion with Russia.

The White House did not immediately respond to requests for comment.

President Trump has repeatedly denied his campaign colluded with Russia. The Kremlin has denied meddling in the election.

The lawsuit, should it go forward, seems likely to help keep the spotlight on the issue of Russian election interference and possible collusion by the Trump campaign.

Both are being investigated by Special Counsel Robert Mueller, whose office declined to comment on the Democratic lawsuit.

Through the process of legal discovery, lawyers for the Democratic Party could force the defendants to produce documents they say relate to the collusion issue.