| | A political battle over a classified whistleblower complaint about U.S. President Donald Trump escalated on Friday, with Democrats warning of a national security threat and Republicans turning it into an attack on Joe Biden, one of Trump's chief political rivals. | | | U.S. President Donald Trump repeatedly pressured Ukrainian President Volodymyr Zelenskiy to investigate Democratic presidential candidate Joe Biden's son, the Wall Street Journal reported on Friday, citing people familiar with the matter. | | | Walmart Inc told staff on Friday it will stop selling e-cigarettes and electronic nicotine delivery products at its U.S. stores, amid a growing crackdown on surging teenage use of such products, reports of vaping-related lung disease and some deaths. | | | Uber Technologies Inc sued New York City on Friday, seeking to void a new rule limiting how much time its drivers can spend in busy areas of Manhattan without passengers, saying the rule threatens to undermine Uber's ride-sharing model. | | | New York City Mayor Bill de Blasio on Friday ended his 2020 presidential campaign that was overshadowed by better-known liberal Democrats, and drew a sarcastic farewell from a fellow New Yorker, President Donald Trump. | | | U.S. President Donald Trump's administration is in a standoff with leaders of the Democratic-controlled U.S. House of Representatives over a whistleblower complaint from within the intelligence community. | | | A group of 23 states on Friday sued to block the Trump administration from undoing California's authority to set strict car pollution rules, one of the biggest U.S. battles over climate change. | | | Democratic presidential hopefuls Pete Buttigieg and Kamala Harris return to the crucial state of Iowa this weekend with pressure mounting on them to break into the top tier of 2020 election contenders. | | | Tropical Storm Imelda dumped torrential rains over the Houston-area, killing at least two people, while rescuers in boats pulled hundreds from flooded cars, the airport temporarily halted flights and tens of thousands of people lost power. | | | The largest field of Democratic presidential candidates in the modern U.S. political era got a little bit smaller on Friday when New York City Mayor Bill de Blasio dropped out of the race. | | | | |