By BRIAN WITTE
ANNAPOLIS, Md. (AP) — Maryland Rep. David Trone says he will run for the U.S. Senate seat that will be open with the retirement of Sen. Ben Cardin. The Democratic representative made the announcement Thursday. He has focused on issues including opioid addiction, mental health, medical research and criminal justice reform while in office. Trone is in his third term in the U.S. House. He is the third Democratic candidate to announce a Senate campaign since Cardin said Monday that he would not seek reelection. Montgomery County Councilman Will Jawando also is running, as well as activist Jerome Segal.