Washington (CNN) A California man who loaned Paul Manafort $1 million in 2017 just before the former Trump campaign chairman was indicted is so concerned about the political fallout that he's asked a court to keep his name secret in a case about Manafort's money.

The person who gave Manafort the loan -- which prosecutors have said is suspiciously like other fake or illegal payments Manafort received -- lives in Southern California, "where President Trump is highly unpopular," according to a filing Thursday made by attorneys for the shell company that had claimed it's the lender.

"It is well known that friendships and other relationships have shattered over political views in our current 'tribal' society," the filing states.

The shell company is willing to share that name of Manafort's benefactor with the court -- but wants "to prevent the general public from learning the identity of a private person."

"He has been and remains extremely concerned that if his identity is revealed to he public, he will suffer grave damage to his business and personal relationships due to the unpopularity of President Trump and anyone closely associated with the President, such as Paul Manafort, in California, where he lives and does business," Thursday's court filing said.

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