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China and the U.S. account for more than a third of greenhouse gases — making it vital that any broad climate plans include the pair.

The GOP nominee is considering walking back a key campaign promise central to his support — whether 11 million immigrants in the U.S. illegally would be deported under a President Trump.

With all the concern about opioid addiction, some patients are worried and want to stop taking powerful medication. Tapering the drugs gradually may be a better way to do that than going cold turkey.

Only about half of Native American students graduate from high school, and few go on to college. One program has worked 17 years to change that.

It's a bit of a renaissance for unlimited plans, which went all but extinct in recent years. But do people really need that much data?

In 2008, Barack Obama found Clinton barely "likeable enough" but needed her support after he secured the Democratic nomination. Now, she's getting the president's endorsement.

Economists fear the potential move could have ripple effects for economic growth, trade and finance across Europe.

The Department of Energy is considering the future of the Strategic Petroleum Reserve. Some argue it's no longer needed or should be smaller because U.S. oil production has increased.

Donald Trump is going to try to put Hillary Clinton on the defensive over past scandals. Meanwhile, she continues to attack Trump's fitness for office and deliberates over a vice president.

Some 30,000 troops from 20-plus nations took part in Europe's biggest military exercise since the Soviet Union collapsed. It was meant to send a message to Russia, but critics warn it could backfire.