Image copyrightGETTY IMAGESImage captionMr Ailes has been accused of sexual assault
Roger Ailes, the long-time boss of Fox News, has resigned after a number of female employees accused him of sexual harassment.
The network's parent company, 21st Century Fox, announced his resignation.
The announcement does not mention the sexual harassment allegations, which have now come from multiple Fox presenters.
Executive chairman Rupert Murdoch wrote that Mr Ailes has made a "remarkable contribution" to Fox News.
"We continue our commitment to maintaining a work environment based on trust and respect," Fox executives Lachlan Murdoch and James Murdoch said in the statement. "We take seriously our responsibility to uphold these traditional, long-standing values of our company."
Image copyrightGETTY IMAGESImage captionMs Carlson (right) worked for Fox News for 11 years
Mr Ailes has run Fox News since it launched in 1996 and is credited with reshaping the American media and political landscape.
A veteran of Republican political campaigns, he turned the cable news network into a ratings leader and an influential force in the Republican Party.
"Rupert Murdoch is a conservative, but the Republican intensity, the conservative passion including the viciousness toward the Democrats that we now see against Hillary Clinton and has been going on against Obama all these years, all that is Roger Ailes,'' Paul Levinson, communications professor at Fordham University, told the AP news agency.
Less than two weeks ago former presenter Gretchen Carlson sued Mr Ailes for sexual harassment and wrongful termination, claims he denies.
Image copyrightGETTY IMAGESImage captionWith hit shows like Hannity, Fox News is the highest-rated news network in the US
Ms Carlson, who worked for the network for 11 years, alleges that he proposed having a sexual relationship with her and he instructed her to turn around in his office so he could look at her backside.
Mr Ailes also allegedly called her a "man hater" and that she needed to "get along with the boys".
A report in New York magazine, citing anonymous sources, said lawyers for 21st Century Fox gave Mr Ailes a deadline of 1 August to resign or face being fired.
Further allegations surfaced in US media that Mr Ailes sexually harassed another Fox News presenter, Megyn Kelly, about 10 years ago, claims he has also denied.
Image copyrightGETTY IMAGESImage captionDonald Trump suggested he would reassess US treaties with longstanding allies
Donald Trump has said that if he is elected president he may abandon a guarantee of protection to fellow Nato countries.
Speaking to the New York Times, Mr Trump said the US would only come to the aid of allies if they have "fulfilled their obligations to us".
Members of Nato have all signed a treaty that says they will come to the aid of any member that is attacked.
Mr Trump will speak on Thursday at the Republican National Convention.
In a preview of what he will tell convention-goers in his speech, he outlined a foreign policy strategy aimed at reducing US expenditure and involvement abroad.
Although the White House has not responded directly to Mr Trump's comments, spokesman Josh Earnest said on Thursday the US commitment to NATO was "ironclad".
He said potential enemies should not misjudge Washington's commitment to defend its NATO allies.
"The president renewed that commitment just two weeks ago today when he travelled to Warsaw, Poland, to attend the NATO summit."
Analysis: Jonathan Marcus, BBC defence and diplomatic correspondent
Image copyrightAFPImage captionThe idea that the US might become an unreliable ally is a nightmare for Nato's European members
Mr Trump's comments hit at the fundamental basis of the Atlantic alliance; that an attack on one ally is an attack on all.
Under Article 5 of Nato's founding treaty, allies are bound to come to the aid of a member under attack.
The US has long been pressing its European allies to spend more on defence. That is slowly beginning to have an effect.
But never has there been a suggestion that the US would renege on its responsibilities.
His comments on Turkey suggest that the Republican contender also seems reluctant to insist upon Nato members maintaining strong democratic principles.
Mr Trump's positions will be seen by Washington's Nato partners as at best eccentric and at worst alarming.
At a time of growing tensions with Moscow, the idea that the US might become an unreliable ally is a nightmare for Nato's European members.
Asked about Russian aggression towards Nato countries in the Baltic region, Mr Trump suggested the US might abandon the longstanding protections offered by the US to such nations.
The divisive Republican candidate also said that, if elected, he would not pressure US allies over crackdowns on political opposition and civil liberties, arguing that the US had to "fix our own mess" before "lecturing" other nations.
He said: "Look at what is happening in our country. How are we going to lecture when people are shooting policemen in cold blood?"
Asked about the failed coup in Turkey on Friday, the Republican candidate praised Turkish president Recep Tayyip Erdogan, who has been criticised by some Western leaders over his increasingly authoritarian rule.
"I give great credit to him for being able to turn that around," Mr Trump said of the failed coup. "Some people say that it was staged, you know that," he said. "I don't think so."
US Secretary of State John Kerry has urged Mr Erdogan to follow the rule of law, amid a crackdown on opposition figures by the Turkish leader in the wake of the coup attempt. But Mr Trump chose not to make a similar statement.
"When the world sees how bad the United States is and we start talking about civil liberties, I don't think we are a very good messenger," he said.
Image copyrightAPImage captionMr Trump will address the Republican National Convention on Thursday
The Republican candidate also said that he would reassess the costs to the US of longstanding defence treaties, potentially forcing allies to take on those costs.
He said he would "prefer to be able to continue" existing agreements - but not if he felt allies were taking advantage of the US.
Referring to what he said were US trade losses, Mr Trump said: "We are spending a fortune on military in order to lose $800bn. That doesn't sound very smart to me."
He also suggested he would close US bases abroad. "If we decide we have to defend the United States, we can always deploy" from American soil, he said "and it will be a lot less expensive".
Mr Trump will address the convention on Thursday following speeches from his running mate, Governor Mike Pence and his wife Melania Trump.
Mrs Trump's speech caused embarrassment when journalists noticed that sections of the text appeared to have been copied directly from a speech given by Michelle Obama at the 2008 Democratic Convention.
Senator Ted Cruz, who came second in the Republican primaries, was booed by convention-goers on Thursday after opting not to endorse Mr Trump in his speech.
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Image copyrightREUTERSImage captionFour men and a woman are believed to have been involved in preparing the attack
Nice truck attacker Mohamed Lahouaiej-Bouhlel received logistical support for his Bastille Day attack from five suspects who are now in custody, French prosecutor Francois Molins has said.
Mr Molins told a news conference the crime had been planned for months.
He said one of the suspects had filmed the scene of the attack the day after.
All five are facing preliminary terrorism charges for their alleged roles in helping Lahouaiej-Bouhlel, a Tunisian living in Nice.
Suspects in court
The four men and one woman aged between 22 and 40 are due to appear in court shortly.
They include an Albanian couple suspected of providing Lahouaiej-Bouhlel with a pistol.
Another of the suspects is a 22-year-old man believed to have received text messages from Lahouaiej-Bouhlel on the night of the attack, discussing the supply of weapons.
Police found a Kalashnikov rifle and ammunition at the man's home, AFP news agency reports.
Like Lahouaiej-Bouhlel, none of those detained were known to French intelligence prior to the attack.
Mr Molins said information from Lahouaiej-Bouhlel's phone showed searches and photos that indicated he had been studying an attack since 2015.
The so-called Islamic State group said Lahouaiej-Bouhlel was one of its "soldiers" - but the lorry driver had not been on any French police watch list.
As the Bastille Day crowd enjoyed festivities on Nice's Promenade des Anglais, Lahouaiej-Bouhlel careered his large white lorry towards them.
Image copyrightAFPImage captionMakeshift memorials have been set up along the Promenade des Anglais in Nice
Two police officers opened fire when he mounted the kerb, but he simply accelerated and then zigzagged for up to 2km (1.25 miles), leaving a trail of carnage.
Police finally managed to bring the lorry to a halt, raking the driver's cabin with gunfire and killing Lahouaiej-Bouhlel.
France has extended its state of emergency until the end of January 2017. It gives the police extra powers to carry out searches and to place people under house arrest.
Too few police?
The government has also launched an inquiry into police actions in Nice on 14 July, amid claims that there were too few police to block a lorry that killed 84 people.
Just one local police car was on duty at the point where the lorry careered onto the pedestrian promenade, the daily Liberation reported.
The local police had neither enough time nor firepower to stop the lorry, it said.
That version of events was disputed by Interior Minister Bernard Cazeneuve.
He said Liberation was referring to a separate, local police roadblock that was diverting traffic. The main roadblock at the start of the promenade was manned by six national police officers, who were "the first to confront the deadly lorry", he said, adding that two police cars of the national police were stationed there.
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