The son of President Trump's former national security adviser, Michael Flynn, is a subject of the federal investigation into Russian election meddling and any possible ties between the Trump campaign and Moscow, according to a Wednesday report from NBC News.

The focus on Michael Flynn Jr. has to do, at least in part, with his work with the Flynn Intel Group, his father's lobbying group.

Trump's former campaign manager, Paul Manafort, campaign ally Carter Page, as well as the president's son-in-law, Jared Kushner have also been under scrutiny in the investigation.

The younger Flynn was asked to leave Trump's transition team in December after embracing the baseless "Pizzagate" conspiracy — the theory that a Washington, D.C., pizza place was a front for a child sex abuse ring run by high-level Democrats.

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The elder Flynn was ousted from his role as national security adviser in February after he lied to the public and Vice President Pence about conversations he had with Russian officials prior to Trump's inauguration.

Flynn Jr. reportedly worked closely with him, including accompanying him on a 2015 trip to Moscow in which the retired general gave a speech at a gala for the state-sponsored RT network.

The Flynn Intel Group reportedly took in $530,000 last year for work benefiting the Turkish government, though the elder Flynn only registered as a foreign lobbyist this year.

A former business associate told NBC News that the younger Flynn played a major role in the group's day-to-day operations and served as his father's chief of staff.

The development comes after Reps. Elijah Cummings (D-Md.) and Eliot Engel (D-N.Y.) said in a letter they are concerned that the elder Flynn did not identify a single foreign government source he met with in the seven years prior to his submission of a security clearance renewal application in 2016.