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Special counsel Robert Mueller has subpoenaed the Trump Organization for records related to his investigation into Russian meddling in the 2016 presidential election, The New York Times reported Thursday.

Mueller is seeking documents related to Russia and other areas, The Times reported, bringing the special counsel's office closer to the president's financial dealings — an area he previously described as a "red line" that Mueller should not cross.

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The subpoena was delivered to the Trump Organization in recent weeks, according to the report, which cited "two people briefed on the matter" as the sources of the information. The White House has referred all inquiries related to the subpoena to the Trump Organization.

"Since July 2017, we have advised the public that the Trump Organization is fully cooperative with all investigations, including the special counsel, and is responding to their requests. This is old news and our assistance and cooperation with the various investigations remains the same today," Trump lawyer Alan Futerfas said in a statement.

At the White House on Thursday, Press Secretary Sarah Huckabee Sanders said, "As we've maintained all along, and as the president has said numerous times, there was no collusion between the campaign and Russia." Pressed for further comment, she declined "out of respect for the special counsel."

Earlier this month, NBC News reported that Mueller is assembling a case for criminal charges against Russians who carried out the hacking and leaking of private information designed to hurt Democrats in the 2016 election.

Mueller is also reportedly investigating a January 2017 meeting in the Seychelles as an alleged attempt to set up a back channel of communications with the Russians.

Trump has repeatedly denied any dealings with Russia. Last year, before his inauguration, Trump's team formally announced that he relinquished his management of the Trump Organization to his sons Eric and Donald Trump Jr. and that an ethics adviser will be appointed to its management team to review all new transactions.