Weekend mass shootings. Back-to-back shootings in Texas, Ohio, shake nation (Wall Street Journal). Some 1 million people with serious mental illness live among the general population. Many do not get treatments they need (Wall Street Journal). String of gun deaths reshapes Democratic primary (Politico). Democratic candidates blame Trump for shootings (Washington Post). Trump responds to shootings: “Hate has no place in our country” (The Hill).

Climate change. Young climate activists are pushing Democrats to the left (New York Times).

Impeachment. Democratic leaders seek to appease liberals demanding impeachment, while protecting vulnerable centrists (The Hill).

Voting security. Paperless voting devices are gaping weakness in U.S. election system (Politico).

Japan vs. South Korea. Japan and South Korea feud intensifies; U.S. stays on sidelines (New York Times).