President's spokesman said he's not going to be in a position 'every time somebody raises a spurious claim' to 'say that it's not true'

White House declined to categorically rule out any occurrence of wrong doing but said there's no 'tangible evidence to indicate that it did'

Clinton allies have written of the book as an 'absurd conspiracy theory'

Revelations will be seized upon by Republicans in White House race

Says those who gave money to foundation saw favorable outcomes

New book, Clinton Cash, points to 'pattern' of donations and rewards

Hillary Clinton shaped State Department policy to reward big money foreign donors to her family foundation, an explosive new book written by a political foe will claim.

According to author Peter Schweizer there is a clear trend of money flowing into the controversial Clinton Foundation and rewards emerging for donors - in forms such as free trade agreements and development projects.

The claims against Clinton, Secretary of State from 2009-13, are laid out in Clinton Cash, due to be published May 5th by HarperCollins.

Bombshell: Clinton Cash, right, a new book by Peter Schweizer, is set to spell out a trend whereby big money donors to the Clinton Foundation found U.S. policies coming out of the State Department shift in their favor

Introducing the book, former George W Bush speechwriter said: 'We will see a pattern of financial transactions involving the Clintons that occurred contemporaneous with favorable U.S. policy decisions benefiting those providing the funds'.

The passage, and examples of the donations and decisions Schweizer analyzes, were published Sunday by the New York Times, which was given an advance copy of the book.

The Times reported that Clinton Cash lists examples of the pattern including a free trade agreement in Colombia that benefited a donor with industrial interests there.

It also cites development projects in Haiti after their devastating 2010 earthquake, and a $1million payment to Bill Clinton made by a Canadian shareholder in the Keystone XL oil pipeline while it was being discussed by State Department officials.

Author: Peter Schweizer, pictured, researched donations made to Clinton's foundation and was noted by the Times for 'meticulously' documenting his sources

As well as contending that the Clintons favored donors to swell the coffers of the foundation, Schweizer also writes that some of the big-money deals 'put millions in their own pockets'.

Marketing information from HaperCollins includes more claims, citing ' the Clinton’s [sic] troubling dealings in Kazakhstan, Colombia, Haiti, and other places at the "wild west" fringe of the global economy.'

It continued that the book will see Schweizer raise 'serious questions of judgment, of possible indebtedness to an array of foreign interests, and ultimately, of fitness for high public office.'

The White House declined on Monday to categorically rule out the occurrence of any wrongdoing but said there's no 'tangible evidence to indicate that it did.'

'I'm not gonna be in a position here, where every time somebody raises a spurious claim...to sit down here and say that it's not true,' President Barack Obama's spokesman, Josh Earnest, said.

Earnest directed reporters who had further questions to Clinton's presidential campaign.

Clinton allies have characterized the book as simply the latest in a series of 'absurd conspiracy theories' designed to derail Clinton's 2016 campaign.

According to the Times, Republican senators - including presidential candidates Rand Paul and Marco Rubio - have been briefed on the book's findings, and are working them into their campaigns.

Paul in particular has been unstinting in his criticism of Clinton, positioning himself as an anti-Hillary candidate before she even announced she was running.

No more, please: In light of her presidential bid, the Clinton Foundation has stopped accepting donations from most governments - notably Saudi Arabia. Pictured above is Clinton while Secretary of State standing with her counterparts from Saudi Arabia (right) and Kuwait (left)

The Kentucky senator's Twitter feed Sunday night included several references to foreign Clinton donations - and his official website includes a whistle-blowing form where members of the public can forward 'additional information' to Paul's campaign.

In light of repeated attacks on the activities of the Clinton Foundation - which is named after Bill, Hillary and their daughter Chelsea - it recently stopped accepting money from all but six foreign governments.

Clinton also resigned from the foundation's board when she announced her presidential bid.