A month before Trump responded to the "red line" question, the White House counsel, Don McGahn, threatened to quit after Trump asked him to have Mueller fired because the president believed he had conflict-of-interest issues that precluded him from running the special counsel investigation. Mueller ordered the Trump Organization to hand over records related to Russian Federation and other topics he is investigating, the people said. A source told CNN that the intent of the subpoena was to "clean up" and ensure all relevant documents are turned over.
Alan Futerfas, a lawyer representing the Trump Organization, said in a statement provided to the publications that since last July, the organization has been "fully cooperative". "This is old news and our assistance and cooperation with the various investigations remains the same today".
The Times, citing two people briefed on the matter, said the subpoena was delivered "in recent weeks".
Asked Thursday about the subpoena and the president's red line comments made to the Times previous year, White House press secretary Sarah Huckabee Sanders referred questions to the Trump Organization.
According to the Times, the subpoena comes amid indications that Mueller may be examining whether foreign money helped fund Trump's political activities.
Mueller's action is likely to make Trump nervous.
One possible area of inquiry plans to build a Trump Tower and the tallest building in the world in Moscow.
News of the subpoena broke shortly after the Trump administration announced a new raft of sanctions on Russia, including Russian nationals previously indicted in the special counsel probe.
Russian Federation has denied US intelligence agencies' conclusion that it meddled in the election and Trump has said there was no collusion between his campaign and Moscow officials.
Congressional committees also have been investigating Russian Federation and the 2016 election and possible collusion with the Trump campaign.
Trump has warned Mueller against stepping beyond the original scope of his investigation and zeroing in on the Trump family's business transactions.