“They didn’t have to be disingenuous and misleading like this,” Kalt later said on Twitter, adding that “in several places, they misrepresent what I wrote quite badly.”

Kalt’s name is mentioned 15 times in Trump’s pretrial brief, despite Kalt last month having signed an open letter from 150 legal experts that explained why the impeachment proceeding against Trump is supported by the U.S. Constitution.

Kalt said he was especially surprised to see a law review article he wrote cited as supporting the following claim by Trump’s lawyers: “When a President is no longer in office, the objective of an impeachment ceases.”

Kalt said in an email that the section of his article cited by Trump “actually says the opposite.”