Martin O’Malley to announce presidential plan on May 30

Former Maryland Gov. Martin O'Malley is expected to announce his run for president May 30 in Baltimore, providing frontrunner Hillary Clinton with a second liberal challenger for the Democratic nomination.

Mr. O'Malley plans to hold a conference call with to supporters Thursday night to outline plans for his announcement in Baltimore, where he served as councilman and mayor before ascending to the governor’s mansion, The Associated Press reported.

“My timeline for awhile has been by the end of May and that remains my timeline. So stay tuned,” Mr. O’Malley told...