Special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE is probing Israeli businessman Joel Zamel after it was revealed he met with Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE prior to the 2016 presidential election, according to The Wall Street Journal.

The Journal reviewed a subpoena regarding Zamel's work, including his crowdsourced analysis firm known as Wikistrat and a private intelligence firm known as the Psy Group.

The two firms have reportedly taken the interest of Mueller's team.

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The Psy Group reportedly conducts private intelligence work and is a competitor of Israeli intelligence firm Black Cube, which is linked to filmmaker Harvey Weinstein who reportedly used the firm to block investigations into his alleged sexual abuses.

Wikistrat uses experts to analyze geopolitical issues.

Both companies, according to the Journal, have been increasingly targeted by Mueller's team in its investigation of possible collusion between the Trump campaign and Russia during the 2016 presidential election.

A review of the company's marketing materials by the Journal uncovered Psy Group's investments in a number of services, including one that promoted intelligence-gathering through romantic or sexual relationships.

The group also touted its "strong operating capabilities within the ‘Deep Web’ and Darknet (often referred to as the ‘Dark Side’ of the Internet),” the Journal reported.

The New York Times reported on Saturday that Trump Jr. met with Zamel at Trump Tower prior to the 2016 presidential election.

George Nader, an emissary to the crown princes of the United Arab Emirates and Saudi Arabia, was also reportedly present at meeting. Nader reportedly told Trump Jr. that the crown princes were eager to help then-candidate Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE win the election.

The publication reported that private security contractor Erik Prince, the former head of Blackwater and brother of Education Secretary Betsy DeVos, arranged the August meeting. Prince declined to comment for the report.

A lawyer for Trump Jr., Alan Futerfas, told the Times in a statement that “prior to the 2016 election, Donald Trump Jr. recalls a meeting with Erik Prince, George Nader and another individual who may be Joel Zamel. They pitched Mr. Trump Jr. on a social media platform or marketing strategy. He was not interested and that was the end of it.”

Trump slammed the Times report on Sunday, saying it was “long & boring story indicating that the World’s most expensive Witch Hunt has found nothing on Russia & me so now they are looking at the rest of the World!”