05/13/2016 04:50 EDT | Updated 05/13/2016 04:59 EDT

Donald Trump In War Of Words With Washington Post Owner, Amazon CEO Jeff Bezos

Washington Post has 20 reporters digging into Trump's past.

NEW YORK — Donald Trump says Amazon founder and Washington Post owner Jeff Bezos is using his newspaper to help the online retailer avoid taxes.

The presumptive Republican presidential nominee told Fox News that Bezos is "using The Washington Post for power so that the politicians in Washington don't tax Amazon like they should be taxed.''

"This is owned as a toy by Jeff Bezos who controls Amazon," Trump told Fox's Sean Hannity. "Amazon is getting away with murder tax-wise. He's using the Washington Post for power so that the politicians in Washington don't tax Amazon like they should be taxed."

Republican U.S. presidential candidate Donald Trump arrives at a campaign rally in Eugene, Oregon, U.S., May 6, 2016 (REUTERS/Jim Urquhart)

Bezos is "worried about me" because "he thinks I would go after him for antitrust, because he's got a huge antitrust problem," Trump said.

"Amazon is controlling so much of what they're doing ... What he's got is a monopoly and he wants to make sure I don't get in."

The comments came after the newspaper's associate editor, Bob Woodward, was quoted as saying the Post has assigned 20 people to dig up Trump's past.

Jeff Bezos, owner of The Washington Post and founder of Amazon, delivers remarks at the grand opening of the Washington Post newsroom in Washington January 28, 2016. (Reuters/Gary Cameron)

"There's a lot we don't know," Woodward told a National Association of Realtors convention in Washington. "We have 20 people working on Trump, we're going to do a book, we're doing articles about every phase of his life," he added.

In a statement, Post executive editor Martin Baron says he's "received no instructions from Jeff Bezos'' regarding campaign coverage, and the decision to write a book came from the newsroom. Amazon didn't immediately respond to a request for comment.

— With files from The Huffington Post Canada

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