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President Trump is in the United Kingdom for a rare second state visit that includes pageantry, policy and protests.

Intelligence officials and lawmakers describe the Chinese-owned social media app as a national security threat. But they haven't shared that evidence with the public.

Negotiators had hoped the meeting would be the first step in implementing last year's Paris agreement to reduce greenhouse gas emissions. But the U.S. election has cast their plans into doubt.

Rachel Martin talks to Canadian Environment Minister Catherine McKenna about the U.S. decision to pull out of the Paris climate accord. U.S. allies failed to persuade President Trump to stay in.

The FAA's order prohibiting Russian flights from entering U.S. airspace is now in effect. Russia is expected to respond in kind, forcing airlines to take longer routes around the massive country

The U.S. and Russia have talked for years about "hybrid war" — waging a conflict on multiple fronts beyond the battlefield. In unprecedented ways, the U.S. is now employing this against Russia.

The timetable for U.S. military leaving Syria has changed. National Security Adviser John Bolton says troops will remain until ISIS is fully defeated and Iran's ambitions in the region are checked.

President Biden is ordering a new round of economic sanctions that include restrictions on dozens of Russian entities and the expulsion of some Kremlin diplomats.

U.S. and Iranian negotiators met separately on Wednesday with Qatari and Pakistani mediators, with "positive progress made," and they agreed to continue discussions, host Qatar said.

U.S. intelligence experts warn that climate change can produce political instability, as crop failures, drought and rising sea levels prompt population shifts.