This establishes the damning quid pro quo: America will help you but only if you smear Biden.
Bizarrely, Trump claimed later the text messages somehow vindicated him and thus "case closed." His fingerprints are all over the gun and the bleeding body is at his feet, yet he insists the smoking gun somehow clears him. Well good luck with that defense.
This dials up impeachment pressure still further and puts GOP senators in an increasingly tight fix, considering Trump has been privately lying to them about the lack of any quid pro quo (details here). It's worth noting that when Richard Nixon was exposed for having lied in private conversations with Republican Senators, his support began to implode in Congress back in the 1970s.
And fortunately the public is listening. Survey results released yesterday showed that a clear majority of Americans now supports impeaching and removing Trump from office (details here).
This weekend might bring more late-breaking developments from Washington, so stay tuned.