Don't miss the powerful "Fox News Reporting" special, anchored by Bret Baier, that follows the Clinton money trail. Tune in to "The Tangled Clinton Web," Friday at 10p ET on Fox News Channel. Plus, tweet about it while you watch, using #ClintonCash. Watch a sneak preview, here.

In a must-see "America's Newsroom" interview, Martha MacCallum challenged former Clinton adviser Lanny Davis on the new allegations laid out in the book, "Clinton Cash."

The book by Peter Schweizer raises questions about donations from foreign entities to the Clinton Foundation and speaking fees paid to President Bill Clinton, possibly in exchange for favors from the State Department.

The New York Times reported Thursday on the sale of a uranium company to Russia, which came as money flowed to the Clintons from those connected to the deal.

(Read more details at

The Clinton campaign pushed back on the report, saying there is no evidence of "undue influence" being exerted by Clinton.

"No one has produced a shred of evidence that Hillary Clinton ever took action as Secretary of State in order to support the interests of donors to the Clinton Foundation," said campaign spokesman Brian Fallon in a statement.

Davis pointed out that a board made up of nine government agencies, not just the State Department, approved the deal.

"The person on that board representing the State Department has said publicly he never heard from Hillary Clinton. The issue of any foundation money or Clinton income never came up. Those are facts that at least should be reported," said Davis. 

MacCallum pushed back, asking how the then-secretary of state could have been unaware of the sale of the uranium company. 

"Why would she never have heard of a deal that dealt with 20 percent of our uranium deposits? If she never heard, then the next question would be: was she doing her job? How could she not have some indication of what was going on in this deal," she asked. 

Watch the full interview above, plus tune in to "Fox News Sunday" at 2/6p ET to hear from Schweizer and Davis on the Clinton money trail.