Donald Trump ’s 2020 re-election campaign and the Republican Party have sued California over its new law requiring political candidates to release their tax returns before running in the state primaries.

One of the suits contends California’s law is “a naked political attack against the sitting President of the United States.”

The law signed last week by Democratic Governor Gavin Newsom is aimed at prying loose the president's tax returns, which he has refused to release, saying they are under audit.