David Rivkin and Elizabeth Price Foley WSJ oped:

Mr. Trump was indicted under New York’s law prohibiting falsification of business records, which is a felony only if the accused intended “to commit another crime” via the false record. Judge Merchan instructed the jury that the other crime was Section 17-152 of New York election law, which makes it a misdemeanor to “conspire to promote or prevent the election of any person to a public office by unlawful means.” Prosecutors alleged that Mr. Trump violated this law by conspiring with his lawyer, Michael Cohen, and Trump-related businesses to “promote” his presidential election by coding hush-money payments as “legal expenses” when they should have been disclosed publicly as campaign expenses or contributions—matters that are governed by FECA.

FECA declares that its provisions “supersede and preempt any provision of state law with respect to election to Federal office.” The 1974 congressional conference committee report accompanying enactment of FECA’s pre-emption language states: “It is clear that the Federal law occupies the field with respect to reporting and disclosure of political contributions and expenditures by Federal candidates.” Federal Election Commission regulations likewise declare that FECA “supersedes State law” concerning the “disclosure of receipts and expenditures by Federal candidates” and “limitation on contributions and expenditures regarding Federal candidates.”

The New York State Board of Elections agreed in a 2018 formal opinion that issues relating to disclosure of federal campaign contributions and expenditures are pre-empted because “Congress expressly articulated ‘field preemption’ of federal law over state law in this area” to avoid federal candidates’ “facing a patchwork of state and local filing requirements.”

In using New York’s election law to brand Mr. Trump a felon based on his actions with respect to a federal election, Mr. Bragg subverts FECA’s goal of providing predictable, uniform national rules regarding disclosure of federal campaign contributions and expenses, including penalties for noncompliance. Congress made its goals of uniformity and predictability clear not only in FECA’s sweeping pre-emption language but also in its grant of exclusive enforcement authority to the FEC for civil penalties and the Justice Department for criminal penalties. Both the FEC and Justice Department conducted yearslong investigations to ascertain whether Mr. Trump’s hush-money payments violated FECA, and both declined to seek any penalties.