NEW YORK — The national Democratic Party sued President Donald Trump’s campaign, his son, his son-in-law, the Russian Federation and WikiLeaks on Friday, accusing them of an intricate conspiracy to undercut Democrats in the 2016 election by stealing tens of thousands of emails and documents.

The lawsuit filed in federal court seeks unspecified damages and an order to prevent further interference with computer systems of the Democratic National Committee.

“During the 2016 presidential campaign, Russia launched an all-out assault on our democracy, and it found a willing and active partner in Donald Trump’s campaign,” DNC Chairman Tom Perez said in a statement. The Democrats accuse Trump and his associates of trading on pre-existing relationships with Russian oligarchs tied to President Vladimir Putin and of collaborating with Russia.

This is the second time in recent history that the DNC has sued a Republican president.

The Democrats sued Richard Nixon’s Committee to Re-elect the President in 1973, following the break-in at the DNC’s Watergate Hotel headquarters.