"Frankly, it's an agreement that I have no problem with, but I had a problem with the agreement that they signed, because, as usual, they made a bad deal," Trump told a news conference.
"So we can conceivably go back in," added the president, who announced his intention to pull out of the 2015 accord on curbing global warming emissions last June.
The process of leaving is long and complex, and Trump's comments will renew questions about whether he actually intends to withdraw or simply wants easier US emissions targets.
A full US pullout could jeopardize global efforts to limit average warming to under two degrees Celsius (3.6 degrees Fahrenheit) over pre-Industrial Revolution levels.
Standing alongside Norwegian Prime Minister Erna Solberg, Trump presented himself as a champion of environmentalism.
"I feel very strongly about the environment," he said. We "want to have clean water, clean air, but we also want businesses that can compete."
The US president has at times seemed torn between advisors like his daughter Ivanka, who advocate for policies that mitigate the effects of climate change, and aides who believe international accords hold America back.
In the year since coming to office, Trump's administration has worked to ease environmental legislation, which industry considers a burden on growth.
"The Paris Accord really would have taken away our competitive edge. And we are not going to let that happen," he said.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.