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Conservative donor David Koch in a 2013 file photo. The political network he and his brother, Charles, have created is not backing Donald Trump's presidential bid this year.

Koch Network Building A Senate Wall Against Trump

Four years after Charles and David Koch's political network opened its bank accounts to promote Republican nominee Mitt Romney, it's now spending millions to save the Republicans' Senate majority from their presidential candidate.

This year's Senate ads will focus on issues involving the candidates, not national issues, said James Davis, spokesman for Freedom Partners Action Fund, a superPAC that is doing most of the network's TV ads.

Trump campaign Chairman Paul Manafort walks off the floor of the Republican National Convention last month after talking to reporters.

Trump Campaign Chair Paul Manafort Resigns

Just months after Paul Manafort was promoted to bring some structure to and scale up Donald Trump's presidential bid, the Washington insider has resigned from the campaign.

In a statement Friday morning, Trump said that Manafort offered his resignation. The candidate said he is "very appreciative for his great work in helping to get us where we are today, and in particular his work guiding us through the delegate and convention process."

"Paul is a true professional and I wish him the greatest success," Trump continued.

Leslie Andermann Gallagher surveys the flood damage to her home in Sorrento, La., on Wednesday.

Catastrophic Floods In Louisiana Have Caused Massive Housing Crisis

Devastating floods in Louisiana have left an estimated 40,000 houses damaged; some 86,000 people have applied for federal disaster aid in the wake of the disaster.

It's a crisis some people are comparing to the aftermath of Hurricane Katrina.

The disaster area stretches over 20 parishes, Eileen Fleming of member station WWNO reports, and officials are working to determine how to provide temporary housing to meet the extreme need.

The audience reacts as Republican presidential candidate Donald Trump delivers a campaign speech in Charlotte, N.C., Thursday.

WATCH: Donald Trump Releases First Campaign Ad, To Air in 4 States

Long doubting the efficacy of television ads, Donald Trump is finally ceding to this one measure of political gravity, airing his first ad of the general election.

The ad, titled "Two Americas: Immigration," will air in four battleground states — Ohio, Pennsylvania, North Carolina and Florida. The Trump campaign is putting $4.8 million behind it for now, and it will run over the next 10 days.

Rescued Relish is an anything-goes condiment made from excess produce that <a href="">Philabundance</a>, a Philadelphia anti-hunger organization, can't move. The relish is modeled on a Pennsylvania Dutch chowchow recipe — a tangy mix of sweet, spicy and sour flavors.

Artisanal Food Waste: Can You Turn Scraps Into Premium Products?

Many efforts to address the food waste crisis hinge on getting consumers to buy fruits and vegetables that are adorably ugly — the bumpy tomato, the bulbous carrot, the dinged apple. Taste and nutritional value aren't compromised by their irregular appearance.

When Teachers Take A Breath, Students Can Bloom

Garrison Institute looks a little like Hogwarts. The retreat center is housed in a former monastery amid tranquil green hills overlooking the Hudson River, 60 miles north and a world away from New York City.

Inside the airy chapel on a recent summer afternoon, about 35 educators from the U.S. and at least five foreign countries are seated quietly, shoes off.

Demonstrators hold Russian opposition flags during a rally protesting against election fraud in Moscow, Saturday, Dec. 24, 2011. Russian President Vladimir Putin blames Hillary Clinton for protests like this, which took place in 2011 and 2012.

In Leak Of Democratic Emails, Questions About Russia's Role

Last month, when Wikileaks published 20,000 emails stolen from the Democratic National Committee, cyber-security experts quickly said that the hack bore a Russian fingerprint.

Russia denies that it is trying to meddle in the U.S. presidential election. But Mark Galeotti, who follows cyber-crime for the Institute for International Relations in Prague, says worldwide research points in the Russians' direction.

Sumner Redstone, seen in 2012, has ousted Philippe Daumon, the executive chairman, president and CEO of Redstone's family media conglomerate Viacom.

Viacom CEO Out As Redstone Family Reasserts Control

Sumner Redstone and his daughter Shari reasserted their control of Viacom Thursday night, resolving a crisis gripping the media conglomerate by arranging the departure of their renegade executive chairman, president and CEO Philippe Dauman in exchange for a $72 million payout.

'We Apologize' To Rio And Brazil, U.S. Olympic Committee Chief Says

Announcing that two swimmers have now flown out of a Rio airport after being detained by police, U.S. Olympic Committee CEO Scott Blackmun is apologizing for how the pair and two other swimmers behaved in Brazil.

"The behavior of these athletes is not acceptable," Blackmun said, referring to swimmers Ryan Lochte, James Feigen, Gunnar Bentz and Jack Conger.

With New Campaign Leadership Comes A New Trump: Apologetic

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