The chief has worked for the department for 27 years and became chief shortly after an officer was killed on duty.

The former Detroit police chief spoke with the media from a small business Wednesday, officially launching his mayoral campaign.

Russia's foreign intelligence chief, Sergei Naryshkin, held a phone call on Tuesday with the director of the U.S. Central Intelligence Agency, John Ratcliffe, the Interfax news agency reported on Wednesday.

The heads of U.S. and Russian spy agencies spoke by phone and agreed to keep up regular contacts to lower the temperature in U.S.-Russia relations, Russian news reports say.