A gunman shot five people at a practice for the Congressional Baseball Game, an annual bipartisan event.
The email's subject line: "One down, 216 to go..."
James Hodgkinson opened fire on a baseball practice for the Republican congressional team on the morning of June 14. Rep. Steve Scalise was among the injured.
A top House Republican, an aide, a lobbyist and two Capitol Police officers were hospitalized after the morning gunfire.
Mass shootings in 2017 are outpacing those in previous years.
Could the president's low approval ratings be driving a more cautious response?