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Former U.S. special envoy to Ukraine Kurt Volker testified in an impeachment hearing Tuesday that allegations against Joe Biden and former Ambassador to Ukraine Marie Yovanovitch, which were promoted by former Ukrainian Prosecutor General Yuriy Lutsenko and spread in the U.S. by Rudy Giuliani, are "self-serving and not credible."

Why it matters: These allegations are now at the heart of the impeachment inquiry, as President Trump and Rudy Giuliani have come under scrutiny for working to push Ukraine to investigate Biden for corruption. Volker, who is one of the witnesses called by Republicans, is one of multiple officials who have testified that the allegations against Biden and Yovanovitch are baseless.

Go deeper: Live updates from Volker and Tim Morrison's testimony

Go deeper

Ben Geman, author of Generate
10 mins ago - Energy & Environment

The road to COP26 gets slightly easier

Illustration: Annelise Capossela/Axios

The bad diplomatic vibes heading into the critical United Nations climate summit in Glasgow, Scotland, might be improving slightly.

Catch up fast: Chinese President Xi Jinping yesterday pledged to end overseas finance for building new coal-fired power plants and boost support for clean energy in developing nations.

Narrowing the employee divide

Illustration: Shoshana Gordon/Axios

Companies are narrowing the blue- and white-collar experience as they're forced to adapt to a worker-led market.

Driving the news: Basic office tools and concepts like corporate communications and schedule flexibility are migrating to frontline operations through investments in technology.

2 hours ago - Health

U.S. to buy 500 million more Pfizer doses to share with the world

A nurse fills a syringe with a dose of the Pfizer-BioNTech COVID-19 vaccine. Photo: Ben Hasty/MediaNews Group/Reading Eagle via Getty Images

The Biden administration is planning to purchase 500 million more Pfizer-BioNTech coronavirus vaccine doses to donate to the world, officials said in an op-ed Wednesday.

Why it matters: The move represents a big step toward making the U.S. a major global vaccine supplier just as China has ramped up exports of its Sinopharm, Sinovac and CanSino vaccines, which can be stored at normal refrigerator temperatures.