U.S. Defense Secretary James Mattis says President Trump is 'wide open' on whether the U.S. will stay in the Paris climate accord.

SEE ALSO: After summits with Trump, Merkel says Europe must take fate into own hands

Appearing on CBS' Face the Nation, Mattis said the president is weighing the pros and cons of the deal.

But Axios news outlet reported on Saturday, citing three sources with direct knowledge, that President Trump has told "confidants," including the head of the Environmental Protection Agency Scott Pruitt, that he plans to leave the landmark international agreement on climate change.

8 PHOTOS Trump appears to shove leader at NATO summit See Gallery Trump appears to shove leader at NATO summit L-R, Belgium's King Philippe, NATO Secretary General Jens Stoltenberg, U.S. President Donald Trump and Britain's Prime Minister Theresa May react during an aerial fly-pass at the new NATO headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann U.S. President Donald Trump jokes with French President Emmanuel Macron about their handshakes in front of NATO leaders, including German Chancellor Angela Merkel, NATO Secretary General Jens Stoltenberg (2ndR) and Belgium King Philippe (L), at the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY From 2ndL, Belgium's King Philippe, NATO Secretary General Jens Stoltenberg, U.S. President Donald Trump, Montenegro's Prime Minister Dusko Markovic, Lithuania's President Dalia Grybauskaite, Croatia's President Kolinda Grabar-Kitarovic and Dutch Prime Minster Mark Rutte walk together inside the new NATO headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Kevin Coombs U.S. President Donald Trump (L) and Britain's Prime Minister Theresa May react during a ceremony at the new NATO headquarters before the start of a summit in Brussels, Belgium, May 25, 2017. REUTERS/Christian Hartmann TPX IMAGES OF THE DAY Turkey's first lady Emine Erdogan, Iceland's Thora Margret Baldvinsdottir, France's first lady Brigitte Trogneux, U.S. first lady Melania Trump, Slovenia's Mojca Stropnik, Bulgaria's Desislava Radeva, Belgium's Amelie Derbaudrenghien and Norway's Ingrid Schulerud- Stoltenberg and Luxembourg's Gauthier Destenay visit the Magritte Museum in Brussels, May 25, 2017. REUTERS/Francois Lenoir U.S. President Donald Trump walks beside Croatia's President Kolinda Grabar-Kitarovic at the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst U.S. President Donald Trump (R) and Luxembourg's Prime Minister Xavier Bettel (2ndR) walk past Britain's Prime Minster Theresa May before the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Kevin Coombs U.S. President Donald Trump (R) walks past Britain's Prime Minister Theresa May (L), Canada's Prime Minister Justin Trudeau (2ndL) and other leaders at the start of the NATO summit at their new headquarters in Brussels, Belgium, May 25, 2017. REUTERS/Jonathan Ernst Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

On Saturday, Trump said in a Twitter post he would make a decision on whether to support the Paris climate deal next week.

The summit of G7 wealthy nations pitted Trump against the leaders of Germany, France, Britain, Italy, Canada and Japan on several issues, with European diplomats frustrated at having to revisit questions they had hoped were long settled.

Trump, who has previously called global warming a hoax, came under concerted pressure from the other leaders to honor the 2015 Paris Agreement on curbing carbon emissions.

Although he tweeted that he would make a decision next week, his apparent reluctance to embrace the first legally binding global climate deal that was signed by 195 countries clearly annoyed German Chancellor Angela Merkel.

"The entire discussion about climate was very difficult, if not to say very dissatisfying," she told reporters. "There are no indications whether the United States will stay in the Paris Agreement or not."