WASHINGTON — Sen. Claire McCaskill (D-Mo.) on Monday said she would introduce legislation to repeal a 2016 law that hampered the Drug Enforcement Administration’s ability to regulate opioid distributors it suspects of misconduct.

The new bill would rescind a little-noticed law championed last year by Rep. Tom Marino (R-Pa.), who President Trump has since nominated to serve as “drug czar” and director of the Office of National Drug Control Policy.