WASHINGTON (AP) — Top U.S. diplomats encouraged Ukraine's newly elected president to conduct an investigation linked to Joe Biden's family in return for a high-profile visit with President Donald Trump. It soon escalated into what one diplomat feared was a "crazy" swap that risked vital U.S. military aid.

That's according to a cache of text messages released late Thursday by House investigators following a 10-hour interview with one of the diplomats, Kurt Volker , who stepped down as special envoy to Ukraine amid the Democrats' impeachment inquiry.

The pages lay out the raw contours of a poten...