WASHINGTON — Attorney General Jeff Sessions vowed on Monday that the Trump administration would vigorously prosecute white-collar crime amid concerns that such cases would fall by the wayside in favor of higher-profile priorities like violent crime and illegal immigration.

Mr. Sessions affirmed the department’s commitment to prosecutions under the Foreign Corrupt Practices Act, which bars corporations from bribing foreign officials to gain a business advantage. President Trump once called it a “horrible law.”

“We will continue to enforce the F.C.P.A. and other anti-corruption laws,” Mr. Sessions said. “Companies should succeed because they provide superior products and services, not because they pay off the right people.”

Mr. Sessions made his remarks at the annual conference of the Ethics and Compliance Initiative, a gathering of lawyers who internally police corporate misconduct. He acknowledged that it was unusual for an attorney general to appear before such a group, but said he wanted to send a message because “I understand there can be some uncertainty when a new administration or new leadership occurs at the Justice Department.”