A broad coalition of law enforcement officials and activists is expected to urge President Trump on Wednesday to adjust policies on policing and criminality, the first time such a group has spoken out against the Trump administration.

Some of the nation’s most prominent prosecutors, police chiefs and criminal justice overhaul advocates — including Senator Thom Tillis, Republican of North Carolina, as well as representatives from the conservative Koch brothers network — will gather in Washington for the National Law Enforcement Summit. The former attorney general Eric H. Holder Jr. and Sally Q. Yates, the acting attorney general whom Mr. Trump abruptly fired in the first few days of his presidency, will speak.

They and other presenters are expected to pose the challenge to Mr. Trump, who ran in 2016 as a “law and order” candidate but whose attorney general’s policies — as well as Mr. Trump’s own messaging — have come under increasing criticism from local law enforcement officials.

In his inaugural address, he described a raging “American carnage” that he vowed to halt — a turn of phrase that rankled local officials who have prided themselves on crime reduction. Mr. Trump has frequently cited his support for police officers, and he has surrounded himself with local law enforcement officials at any opportunity.