On May 15, Oklahoma Governor Mary Fallin signed SB 323. It roughly doubles all the candidate filing fees. This means the filing fee for independent presidential candidates, and the presidential nominees of unqualified parties, will be $35,000 in 2020, unless the fee is struck down.
The U.S. Supreme Court ruled in Lubin v Panish and also Bullock v Carter that filing fees are unconstitutional unless they are needed to keep ballots from being too crowded. Because the new filing fee for Governor will be $2,000, it may be difficult for the state to explain why it needs $35,000 for President.