BOSTON (AP) — Members of Massachusetts' all-Democratic congressional delegation are faulting U.S. Attorney Andrew Lelling for saying participants in the state's voter-approved marijuana trade could be at risk of prosecution.

Lelling said Monday he "cannot provide assurances that certain categories of participants in the state-level marijuana trade will be immune from federal prosecution" after U.S. Attorney General Jeff Sessions moved to rescind an Obama-era policy that called for non-interference with state-level legal marijuana operations.

Sen. Elizabeth Warren called the actions by Ses...