Paul Manafort, President Trump's ex-campaign chairman, is being investigated for possible money laundering, according to The Wall Street Journal, which cited three people familiar with the matter.

The newspaper writes that the Manhattan U.S. attorney's office is launching the probe which now joins other state and federal probes connected to Manafort.

WSJ adds that the investigation is led by the U.S. Attorney for the Southern District of New York in conjunction with a probe special counsel Robert Mueller is carrying out related to possible money laundering by Manafort.

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Tuesday's report comes in the wake of Mr. Trump's reported interviewing of at least two people for U.S. attorney positions in New York -- which includes the office which oversees the fresh Manafort probe.

New York State Attorney General Eric Schneiderman has been investigating Manafort's real estate holdings in New York.

Mueller, who is using a federal grand jury in Washington, D.C. to help with his investigation, is said to be particularly focused on Manafort's lobbying efforts between 2012 and 2014 for a pro-Russian Ukrainaian political party, and his offshore banking and financial dealings.