Congress has no right to conduct a "do-over" of special counsel Robert Mueller's Russia probe, the White House said in a letter blasting House Democrats' "sweeping" requests for documents as an effort to harass political opponents.

The May 15 letter from White House counsel Pat Cipollone to House Judiciary Committee Chairman Jerrold Nadler says the committee's main probe of President Donald Trump's presidency serves no legitimate legislative purpose.

It was drafted in response to a March 4 request for documents from Nadler, who is running a congressional investigation into allegations of obstruction of justice, public corruption and other abuses of power.