Special counsel Robert Mueller subpoenaed President Donald Trump’s businesses “in recent weeks” for documents, some of which relate to Russia, The New York Times reported, citing two people briefed on the matter.

The newspaper says it marks the first time Mueller, who is probing Russian involvement in the 2016 election, has asked for information directly related to the Trump Organization. The action comes as the former FBI director appears to be looking into the role foreign money could have played in the president’s political activities, the newspaper reported.

Trump has previously said he believes the special counsel investigating his finances would cross a red line. The Trump Organization has denied holding real estate in Moscow. His company considered developing a Trump Tower in Moscow in late 2015 and early 2016 before abandoning the plan, The Washington Post reported.

Earlier this month, former Trump aide Sam Nunberg said investigators wanted information about the Trump Tower plans.

[CLICK HERE To Follow The Trump Train On Twitter]