Justice Department ethics experts have decided Robert Mueller can proceed as the special counsel leading the investigation into the Russian government's efforts to interfere in the 2016 election, despite his former law firm's representing President Trump's daughter Ivanka and son-in-law Jared Kushner.

The law firm, WilmerHale, also represents Trump's former campaign manager, Paul Manafort, who has been at the heart of questions over whether Trump's campaign colluded with the Russians.

Mueller had no involvement in any work done for the three, according to Bruce Berman, a spokesman for the law firm.

Berman said Mueller "had no role whatsoever in the representation of any client in connection with the Russia inquiry, and he has no confidential information with respect to such matters," the spokesman told NPR last week.

The DOJ cleared Mueller in a statement released Tuesday:

"We can confirm that the Department ethics experts have reviewed the matters and determined that Mr. Mueller's participation in the matters assigned to him is appropriate."

Mueller is just getting his investigation underway, after being tapped for the job by Deputy Attorney General Rod Rosenstein on Wednesday. Mueller resigned from WilmerHale immediately after being selected.

The DOJ said Tuesday that Mueller now has office space for his team in Washington.

As FBI director from 2001 to 2013, Mueller overhauled that agency, increasing its focus on terrorism and cyberthreats following the Sept. 11 terror attacks.

In the time since, he's become something of a "consummate cleanup man," writes The Intercept:

"Last year, a federal judge appointed him to help settle more than 500 lawsuits against Volkswagen for its use of software to hide excess vehicle emissions. The NFL tasked him with writing a report about Baltimore Ravens football player Ray Rice's assault of his then-fiancée in an elevator. And Booz Allen Hamilton, the former employer of National Security Agency whistleblower Edward Snowden, hired Mueller to conduct a review after another employee, Harold Martin, removed classified NSA information."

Intelligence agencies have already concluded that Russia attempted to interfere in the 2016 U.S. election. In his order creating a special counsel, Rosenstein appointed Mueller to investigate "any links and/or coordination between the Russian government and individuals associated with the campaign of President Donald Trump."

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