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A number of American states and metropolitan "hot spots" are vulnerable to outbreaks of vaccine-preventable disease, new research suggests. The reason? Children whose parents opted out of vaccination.

Special counsel Robert Mueller's team scored a procedural victory Friday in its case against a Russian company accused of bankrolling a vast campaign to meddle in the 2016 election, successfully fighting back an effort to review the instructions given to grand jury before it indicted the company.

President Donald Trump's attorneys, armed with the Department of Justice inspector general's report excoriating former FBI Director James Comey, now believe they can challenge any effort by the special counsel to pursue a subpoena seeking the President's testimony on obstruction of justice, according to sources familiar with their thinking.

It's been more than eight months since Hurricane Maria hit Puerto Rico. People are still using tarps for roofs. Officials are worried another storm could wipe out power on the island again. And a new estimate of the death toll suggests thousands more died than we knew. CNN correspondent Leyla Santiago and senior investigative reporter John Sutter are seeing it unfold firsthand, documenting the devastation and digging on the death toll. I asked them to give me and others on the mainland a window into what it's really been like over there. Our Slack conversation, condensed and lightly edited for clarity, is below.

Democrats will hold their convention in 2020 earlier than they have in more than two decades, Democratic operatives tell CNN, partly out of anticipation of a crowded and contentious primary.

Two years after a child was decapitated on the world's tallest water slide in Kansas, investigators revealed in March that they found design flaws and unreported injuries at the site.

For the next month, the world will be glued to the biggest sporting event on the globe: the World Cup. Thirty two countries qualified, but alas, yours isn't among them. (We're looking at you, US and Italy.)

The Arizona Republican Party is calling on a Republican state lawmaker to resign after he said that "immigration today represents an existential threat to the United States" and "there aren't enough white kids to go around."

CNN's Chris Cuomo debates Rep. Jim Jordan (R-OH) over the Justice Department Inspector General report on the FBI's actions during the 2016 election.

Republicans are circulating a draft immigration bill that would overhaul the country's legal immigration system, boost border security, overturn rules that govern family separation at the border and provide a path to citizenship for recipients of the Deferred Action for Childhood Arrivals.