French President Emmanuel Macron told President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE he read "Art of the Deal" during a conversation about negotiating with the European Union (EU) this month, according to an Axios report.

A source familiar with the conversation told Axios that Macron mentioned the U.S. president's book as an explanation for his leadership tactics.

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Trump reportedly suggested that Macron tell the EU to negotiate with the U.S., but Macron refused.

"I read the Art of the Deal," Macron replied, smiling, according to the source who spoke to Axios. "I know that we need to retaliate first so we have some leverage in the negotiation."

The exchange took place at this month's NATO summit in Brussels.

Trump published "Art of the Deal," a book about how to succeed in business, with journalist Tony Schwartz in 1987.

Since Trump was elected, Schwartz has publicly criticized him, saying he is "incapable of reading a book, much less writing one."

According to the Axios report, Macron's response at the NATO summit is part of a pattern of foreign leaders who communicate with Trump using his own rhetoric. Because Trump is known to respond to hard-line, finance-oriented negotiating tactics, leaders including North Korea's Kim Jong Un have reportedly adopted a similar style.

Macron and Trump have a relatively cordial relationship, though the two have publicly spatted before.

Trump has reportedly told Macron that France should leave the EU.