The White House did not immediately respond, but Director of Strategic Communications Hope Hicks said, "I think his tweet was clear. He will make a decision this week."
Trump’s apparent reluctance to embrace the first legally-binding global climate deal annoyed G7 leaders including German Chancellor Angela Merkel.
"The entire discussion about climate was very difficult, if not to say very dissatisfying," Merkel told reporters on the sidelines of the summit. "There are no indications whether the United States will stay in the Paris Agreement or not."
The Paris Agreement entered into force on November 4, 2016 and has been signed by 197 countries, of which 147 have now formally ratified it. Together, these countries represent more than 75 percent of global greenhouse gas emissions.
Trump has proposed to amend the agreement, with his administration officials reportedly telling lobbyists and European diplomats that the United States will withdraw from the climate pact unless it secures concessions for the fossil fuel industry.