House Democrats on Friday accused former President Donald J. Trump of accepting “hundreds of unconstitutional and ethically suspect payments” through the Trump International Hotel in 2017 and 2018, moving weeks before the election to remind voters of the ethical issues raised by his refusal to divest from his businesses while in office.

The 58-page report from Democrats on the Oversight Committee includes their final findings in a yearslong investigation digging into the Trump Organization’s management of the hotel. It accuses Mr. Trump of ripping off the Secret Service by charging the agency exorbitant rates and of inappropriately accepting payments from clients who worked for state governments or were seeking appointments and pardons from him.

“Mr. Trump has made clear that he will not only refuse to divest from his businesses in a possible future presidency, but he will seek to multiply opportunities to commodify the Oval Office for his personal enrichment by turning thousands of civil service jobs into patronage positions — all with the attendant payoff possibilities from supplicant job-seekers and the prospective blessing of his handpicked Supreme Court justices,” said Representative Jamie Raskin of Maryland, the top Democrat on the Oversight Committee.

House Republicans dismissed the report as old news and accused Democrats of hypocrisy for investigating Mr. Trump but not members of President Biden’s family, including his son Hunter.