Speaking at a rally in Florida, the Republican presidential nominee said the campaign was “doing really well”.
According to media outlets, it was in turmoil after Donald Trump repeatedly attacked parents of a fallen Captain Humayun Khan.
Staffers told CNN that they “feel like they are wasting their time”.
Donald Trump said in Dayton Beach: “I just want to tell you the campaign is doing really well.
“It’s never been so well united… I would say right now it’s the best in terms of being united that it’s been since we began.”
Earlier Donald Trump’s campaign chairman Paul Manafort blamed reports of disunity on Trump’s opponent, Democrat Hillary Clinton.
“This is another Clinton narrative that she put out there and the media is picking up on,” he said.
“Mr. Trump has appeared this week at crowds that are overflowing into the street,” Paul Manafort added.
Donald Trump has been sharply criticized for his attacks on the bereaved parents of the Muslim soldier killed in Iraq.
His ongoing war of words with Khizr and Ghazala Khan has intensified rifts within the Republican Party.
NBC News reported that senior Republicans plan to stage an “intervention” to get the campaign back on message, stressing issues such as jobs and trade deals.
According to NBC, the effort will be led by Republican National Committee Chairman Reince Priebus and Donald Trump allies, former House Speaker Newt Gingrich and former New York Mayor Rudy Giuliani.
“I think some of what Trump has done is very self-destructive,” Newt Gingrich told Fox Business Network on August 3.
Three prominent Republicans – including New York Congressman Richard Hanna – have said this week that they would vote for Hillary Clinton, saying Donald Trump was unfit to serve as president.
Many Republicans opposed to Donald Trump have stopped short of supporting Hillary Clinton, saying they would vote for a third candidate instead.
One person who did say he would back Donald Trump on August 3 was Clint Eastwood.
While stopping short of endorsing Donald Trump, Clint Eastwood said he would vote for him.
“I can understand where he’s coming from, but I don’t always agree with it,” Clint Eastwood, 86, told Esquire magazine.
Clint Eastwood also said Donald Trump was an enemy of political correctness, adding: “We see people accusing people of being racist and all kinds of stuff. When I grew up, those things weren’t called racist.”
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