President Trump on Tuesday faces a critical test as Republican voters head to the polls in two races where he delivered key endorsements in Senate primaries that could shape the battle for control of Congress.

In West Virginia, Trump intervened at the eleventh hour to urge Republicans to reject the surging Don Blankenship, a coal baron whose criminal past could blow an otherwise prime pick-up opportunity for the GOP. In Ohio, Trump personally recruited and backed Rep. Jim Renacci, R-Ohio, who has run an underwhelming race against wealthy businessman Mike Gibbons.