Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE denied requests from his own presidential campaign to research his past, according to a new report.

Trump’s reluctance contributed to his team being largely unprepared for the fallout over his past treatment of women, Bloomberg Politics reported Thursday.

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Bloomberg said Trump’s first campaign manager requested he undergo a forensic evaluation before entering the presidential race.

Corey Lewandowski argued the move, which is traditional for public figures seeking office, would help Trump’s team prepare for attacks on the Republican billionaire.

Trump denied Lewandowski a full vetting, however, before ultimately launching his White House run in June 2015.

Lewandowski was allowed to research Trump’s position on the Iraq War, according to people familiar with the campaign’s early days. Trump’s campaign also prepared for the businessman’s past donations to Democrats.

Trump also reportedly barred his later campaign chairman, Paul Manafort, from doing a full investigation as well.

A source told Bloomberg that the Republican National Committee (RNC) did opposition on Trump and the other primary candidates, but didn't turn up anything damaging.

But a 2005 tape emerged last week in which Trump speaks about his failed sexual advances on a married woman and about how his celebrity allows him to grope women. The revelations have rocked his campaign over the past week.

Multiple women have since come forward to accuse the GOP presidential nominee of kissing or groping them without permission.

Trump on Thursday lashed out at his accusers, arguing their accounts are “preposterous, ludicrous and defy logic."

Kellyanne Conway, Trump’s current campaign manager, on Wednesday said she remains unsure what future attacks are looming.

“I don’t know what’s out there,” she said on Fox News. "There’s no way to know what is and isn’t out there."