A group is suing former President Barack Obama for illegally entering the Paris Climate Agreement and they claim that they have proof.

According to The Daily Caller:

Former President Barack Obama illegally entered into the Paris climate agreement, a lawsuit filed Monday says, citing a legal memo the Obama administration allegedly used to justify the deal.

The lawsuit asserts that the Obama administration argued the agreement could be signed without Senate approval because it does not set “legally binding targets and timetables.” Such justifications are a misrepresentation of the law, according to the lawsuit.

“This memo demonstrates the Obama administration’s unlawful entry into the Paris treaty,” Chris Horner, a former senior fellow at the Competitive Enterprise Institute, noted in a press statement attached to the lawsuit. The memo “represents a major political and legal scandal,” he added. Horner left CEI in April.

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Senate approval is required for any international deal that seeks “to adopt 1 targets and timetables,” not merely those that are “legally binding,” Horner noted in the lawsuit, referring to a referendum produced by the Senate in 1992 after the Kyoto Protocol, an international climate agreement designed to reduce greenhouse gas emissions. The U.S. never ratified Kyoto.

President Trump announced his intention to leave the agreement in 2017 citing the astronomical costs and the likelihood the signatories would not hold up their end of the deal like the United States would.