Sounds like a “rule” not a law. And also sounds very unconstitutional.

Someone being sued by the government should flip the script and ask the government to ante up.

CNN’s Katelyn Polantz reported that the White House circulated a memo to agency heads Thursday attacking the lawsuits as partisan impediments to president Donald Trump’s agenda and encouraged them to invoke a procedural rule requiring plaintiffs to post money at the start of their court case to cover costs and damages if the government ultimately prevails.