The texts between Mr. Trump’s top diplomats to Ukraine and an aide to President Volodymyr Zelensky included a discussion about language for a proposed statement, which the Ukrainians never released. Kurt Volker, the American former special envoy to the country, is said to have told House investigators that the idea for the statement came from Rudy Giuliani, Mr. Trump’s personal lawyer.

Yesterday: Mr. Volker became the first witness in the impeachment inquiry against Mr. Trump. He turned over text messages indicating a dispute among American diplomats about whether Mr. Trump was seeking a quid pro quo from Ukraine, the charge at the heart of the inquiry.

Related: Ukraine’s top prosecutor said today that he would review several investigations handled by his predecessors, including a case involving a company that employed Joe Biden’s son.

Go deeper: The Times has untangled the discredited conspiracy theory — involving Democrats, the 2016 election and hackers — that Mr. Trump raised in his July call with Ukraine’s leader.

Another angle: Already facing an inquiry for asking Ukraine to investigate the Biden family, Mr. Trump on Thursday publicly called on China to do the same. Here’s what we know about the Chinese business ventures of Mr. Biden’s son Hunter.