David Koch, who built one of the nation's largest private businesses with his brother Charles and pumped money into conservative groups to help reshape American politics, has died.

Charles Koch confirmed the news in a statement on Friday that referenced David's long-running ailment.

Wyoming, which is among the reddest of Republican states and a bastion of free enterprise, thinks it may have found a way to end crippling air ambulance bills that sometimes top $100,000 per flight.

The state's unexpected solution: Undercut the free market, by using Medicaid to treat air ambulances like a public utility.

Days after the United States tested a new cruise missile, Russian President Vladimir Putin is calling for a symmetrical response.

His order comes weeks after the Intermediate-Range Nuclear Forces Treaty, a landmark arms control agreement between Washington and Moscow, collapsed on Aug. 2 amid concerns of a renewed arms race.

Signalling the possibility of more interest-rate cuts, Federal Reserve Chairman Jerome Powell said the central bank will "act as appropriate" to sustain the economic expansion as the trade war with China takes a toll on global growth and the U.S. economy.

In prepared remarks Friday to a Kansas City Fed gathering in Jackson Hole, Wyo., Powell said the economy faces "significant risks" and cited several developments that have roiled financial markets in recent weeks.

Updated at 11:19 a.m. ET

China says it will slap tariffs on autos, auto parts and thousands of other U.S. goods worth a total of $75 billion. President Trump promised to respond. Friday's announcement by China marks an escalation in a trade war that has rippled through the world economy and raised fears of a U.S. recession.

The first batch of tariffs will go into effect Sept. 1, and a second, on autos and auto parts, is due to go into effect Dec. 15. The tariffs range from 5% to 25%.

French President Emmanuel Macron is calling on world leaders to place the massive fires destroying Brazil's Amazon rainforest at the top of their agenda as they gather in France's southwest for the Group of Seven summit.

"Our house is burning. Literally. The Amazon rain forest – the lungs which produces 20% of our planet's oxygen – is on fire," Macron wrote in a tweet Thursday. "It is an international crisis. Members of the G7 Summit, let's discuss this emergency first order in two days!"

Pedro Lopez was in seventh grade when a rumor began to spread through his school in 2008: Immigration and Customs Enforcement agents were raiding Agriprocessors, the meatpacking plant where his parents worked, in his small hometown of Postville, Iowa.

Three weeks after Democrats took control of the U.S. House in the 2018 midterm elections, about 40 reelected and recently defeated lawmakers in the centrist Republican Main Street Caucus gathered at the Capitol Hill Club to sift through the electoral wreckage.

The caucus — then led by Reps. Rodney Davis of Illinois, Jeff Denham of California, Mario Diaz-Balart of Florida and Fred Upton of Michigan — was scheduled to hold its regular meeting with the outside group that inspired its name, the Republican Main Street Partnership, led by president and CEO Sarah Chamberlain.