The newspaper, citing two unnamed sources familiar with the matter, reported that the grand jury had begun its work in the US capital Washington "in recent weeks".
Special Counsel Robert Mueller has impaneled a grand jury for his investigation into Russia's interference in the 2016 election, and that grand jury has issued subpoenas related to the meeting between Donald Trump Jr. and several Russians.
The establishment of a grand jury will allow Mueller - a former FBI director - to subpoena documents and get testimony under oath, as well as issue possible indictments.
Chris Coons, D-Del., and Thom Tillis, R-N.C., co-authored the Special Counsel Integrity Act, which would require judicial review of Mueller's potential termination.
All of the above indicates both the importance of the special counsel and the importance of the investigation he is conducting.
At a boisterous rally in Trump-friendly West Virginia Thursday, he also challenged Democrats to either continue their "obsession with a hoax" or begin serving the interests of the American people.
And that dirt is probably about to be exposed.