Here's how many millions Robert Mueller has now brought in with forfeitures during his investigation
FBI Director Robert Mueller testifies during a House Appropriations Committee hearing on the FBI Budget, on Capitol Hill on March 19, 2013 in Washington, D.C. (UPI/Kevin Dietsch via Creative Commons)

National security expert Marcy Wheeler noted Thursday that special counsel Robert Mueller has collected tens of millions in forfeitures throughout the duration of his investigation.

"While Trump has kept the government shut down, Mueller just brought in another $4.5 million to self-fund investigation the President," Wheeler tweeted.

Earlier in the day, the Skadden Arps law firm -- that worked with former Trump campaign chairman Paul Manafort for his work in Ukraine -- settled a case for nearly $4.7 million and registered as a foreign lobbyist.

Manafort, the national security expert noted, "won't actually be able to pay all" of the $46 million he was ordered to forfeit following Mueller's investigation.

Nevertheless, the "hypothetical total in forfeiture" from the special counsel probe is roughly $52 million given forfeitures from Manafort, the Skadden Arps settlement and a $1 million from Mueller's mystery appellant.