In his second term, U.S. President Donald Trump has moved aggressively to expand the authority of the executive branch, thereby upending our traditional system of checks and balances among the three branches of government. Reforming this system while he still holds office will be impossible, but he will eventually move on, and Congress should be planning now for changes to the system of shared governance to limit outsize executive authority and prevent future autocratic abuses.

Although President Trump has pushed the envelope further than most could have imagined possible, his abuse of power is reminiscent of the Nixon administration. After the Watergate scandal and the resignation of President Richard Nixon, Congress took steps, such as the Anti-Impoundment Act, to curb presidential excesses. Following the second Trump administration, an even more fundamental restructuring may be in order.

One thrust of Trump’s second term has been a concerted effort to sideline the legal referees charged with checking abuses. Nearly a score of inspectors generals charged with addressing fraud and abuse have been summarily dismissed without cause. The Office of Government Ethics has been decapitated. The head of the U.S. Office of Special Counsel charged with enforcement of civil service laws, such as whistleblower protection, has been removed.

America did not intend to elect a dictator.

The net result is that violations of laws and ethics go unchecked because independent oversight has been neutralized. To prevent the recurrence of future lawless regimes, Congress should reinstitute some of the checks Mr. Trump has shredded but in a way that insulates them from unilateral executive reversal. Congress needs to strengthen the institutional guardrails against executive violations of ethical standards and for protection of federal employees from illegal actions and enforceable standards for scientific integrity.

One step would be a statute relocating inspectors general (IGs) within the legislative branch. IGs do not perform an inherently executive function as they lack authority to implement their recommendations. Congress should appoint fixed-term IGs and team them with the Government Accountability Office (GAO), another legislative body, to keep this strengthened watchdog function beyond executive obstruction.

In this restructuring, the independent IGs could also conduct scientific integrity reviews to resolve challenges to the accuracy of scientific and technical agency information. This would put control of scientific and technical data and analyses beyond the unilateral control of the very bureaucracies responsible for creating them and thereby prevent them from peddling disinformation. Moreover, uniform procedures would facilitate the use of expert scientists from other agencies, universities, and other institutions to serve as review panels.

Similarly, institutions charged with enforcing civil service protections, such as the Office of Special Counsel........

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