Trump reportedly blocked his campaign from doing opposition research on him

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Republican presidential nominee Donald Trump blocked his campaign staffers from researching his past, according to a report in Bloomberg.

It is common for political campaigns to do opposition research on their own candidates so that they can be prepared to handle any attacks that come their way. But sources told Bloomberg that Trump refused and that it became a contentious issue within the top ranks of his campaign.

Several top advisers who have worked with the Trump campaign since its early days — including former campaign manager Corey Lewandowski and former campaign chairman Paul Manafort — asked for his permission to do the research, but Trump reportedly wouldn't allow it.

Over the past week, the Trump campaign has scrambled to respond to stories about the candidate's treatment of women. A leaked recording from 2005 showed him making derogatory comments toward women, and stories published in several news outlets this week include new allegations of sexual misconduct dating back years.

RELATED: Republicans coming out against Donald Trump

Republicans coming out against Donald Trump
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Republicans coming out against Donald Trump

Arizona Senator John McCain: "I will not vote for Donald Trump."

(Photo by Patrick T. Fallon/Bloomberg via Getty Images)

2012 presidential nominee Mitt Romney: Trump's "vile degradations ... corrupt America's face to the world."

(AP Photo/Rick Bowmer, File)

New Hampshire Senator Kelly Ayotte: "I will not be voting for Donald Trump."

(AP Photo/Pablo Martinez Monsivais)

Former Florida Governor Jeb Bush: "No apology can excuse away Donald Trump's reprehensible comments degrading women."

(Photo by Paul Marotta/Getty Images)

Texas Senator Ted Cruz: Trump's comments are "disturbing and inappropriate, there is simply no excuse for them."

(Photo by Chip Somodevilla/Getty Images)

South Carolina Senator Lindsey Graham: "I have never been comfortable with Donald Trump as our Republican nominee."

(Photo by Riccardo Savi/Getty Images for Concordia Summit)

Former Secretary of State Condoleezza Rice: "Donald Trump should not be President."

(Photo by Vladimir Shtanko/Anadolu Agency/Getty Images)

South Dakota Senator John Thune: "Donald Trump should withdraw and Mike Pence should be our nominee effective immediately."

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Alaska Senator Lisa Murkowski: "I cannot and will not support Donald Trump for president."

(Photo by Matthew Busch/Bloomberg via Getty Images)

Nebraska Senator Ben Sasse: Donald trump "is obviously not going to win [and should] step aside."

(Photo credit SAUL LOEB/AFP/Getty Images)

Idaho Senator Mike Crapo: Donald Trump should step aside due to "disrespectful, profane and demeaning" behavior.

(Photo by Pete Marovich/Bloomberg via Getty Images)

Utah Senator Mike Lee: Donald Trump is a "distraction.

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Maine Senator Susan Collins: Donald Trump is "unsuitable for the presidency ... I [can] not support his candidacy."

(Photo By Bill Clark/CQ Roll Call)

Texas Senator John Cornyn: "I am disgusted by Mr Trump's words about women."

(Photo By Tom Williams/CQ Roll Call)

Former Utah Governor Jon Huntsman: "The time has come for Governor Pence to lead the ticket."

(Photo by Larry French/Getty Images)

Utah Representative Mia Love: Stated she "cannot vote for" Donald Trump. 

(Photo credit SAUL LOEB/AFP/Getty Images)

Ohio Senator Rob Portman: "I can no longer support [Trump]."

(AP Photo/Alex Brandon, File)

Colorado Representative Mike Coffman: Donald Trump should withdraw "for the good of the country."

(Photo By Brent Lewis/The Denver Post via Getty Images)

Missouri Representative Ann Wagner: "I withdraw my endorsement and call for Governor Pence to take the lead" in the race.

(Photo via REUTERS/Gary Cameron)

Nevada Representative Joe Heck: "I believe our only option is to formally ask Mr. Trump to step down."

(AP Photo/Julie Jacobson)

Arizona Senator Jeff Flake: Donald Trump is "wrong about his level of support. He needs to withdraw from the race."

(AP Photo/Ross D. Franklin, File)

Virginia Representative Barbara Comstock: Trump's remarks were "disgusting, vile, and disqualifying."

(Photo by Jahi Chikwendiu/The Washington Post via Getty Images)

Illinois Senator Mark Kirk: Donald Trump is a "malignant clown — unprepared and unfit to be president of the United States."

(AP Photo/M. Spencer Green, File)

Alaska Senator Dan Sullivan: "I will support Governor Mike Pence for President."

Andrew Harrer/Bloomberg via Getty Images

Colorado Senator Cory Gardner: Donald Trump's flaws are "beyond mere moral shortcomings ... I cannot and will not support someone who brags about degrading and assaulting women."

(Photo by Samuel Corum/Anadolu Agency/Getty Images)

New Jersey Representative Scott Garrett: Has stated he is "appalled" by Trump's actions.

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Nebraska Senator Deb Fischer: "It would be wise for [Trump] to step aside."

(AP Photo/J. Scott Applewhite)

South Dakota Governor Dennis Daugaard: "Enough is enough. Donald Trump should withdraw in favor of Governor Mike Pence."

(AP Photo/James Nord)

Former New York Governor George Pataki: "Enough! [Trump] needs to step down."

(Photo by Alex Wong/Getty Images)

Former GOP presidential candidate Carly Fiorina: "Donald Trump does not represent me or my party."

(AP Photo/Michael Conroy)

Michigan Representative Fred Upton: Donald Trump needs to "step down."

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Tennessee Governor Bill Haslam: Trump should "step aside and let Gov. Mike Pence assume the role as the party's nominee."

(Photo by Jason Davis/Getty Images)

Utah Governor Gary Herbert: "I will not vote for Trump."

(Photo by James MacDonald/Bloomberg via Getty Images)

Alabama Governor Robert Bentley: "I cannot and will not vote for Donald Trump."

(AP Photo/Brynn Anderson)

California Representative Steve Knight: Trump's comments were "inexcusable."

(Photo by Andrew Harrer/Bloomberg via Getty Images)


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