"I want to thank everyone for your tremendous support. Beat Crooked H!" Trump wrote in his first tweet of the day.

There is great unity in my campaign, perhaps greater than ever before. I want to thank everyone for your tremendous support. Beat Crooked H! — Donald J. Trump (@realDonaldTrump) August 3, 2016

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Trump has faced backlash from both sides of the aisle over his feuding with the parents of an American Muslim soldier killed in Iraq.

said Monday of his comments on the Khan family. "I don't regret anything," TrumpMonday of his comments on the Khan family.

fired. Responsibilities also shifted among some campaign staff earlier this week after an aide that helped plan the GOP convention last month was

John Harwood, CNBC's chief Washington correspondent, tweeted that Trump's campaign chief, Paul Manafort, was "not challenging Trump anymore. Mailing it in. Staff suicidal," citing an ally of Manafort.

longtime ally of Paul Manafort, Trump's campaign manager: "Manafort not challenging Trump anymore. Mailing it in. Staff suicidal." — John Harwood (@JohnJHarwood) August 3, 2016 NBC News's Ali Vitali shared Harwood's tweet, adding that a Trump campaign source told her that his information was "all true," adding it was "way worse than people realize."

A Trump campaign source, in reax to this, tells me "it's all true" and "way worse than people realize." https://t.co/nvioNcjMCJ — Ali Vitali (@alivitali) August 3, 2016

Trump senior advisor Jason Miller responded to Harwood publicly, saying "the idea that Paul Manafort is mailing it in is completely erroneous," pointing to the campaign's latest fundraising numbers.