Mr. Clinesmith incorrectly said that Mr. Page was “never a source” and sent the C.I.A.’s information to the supervisor. He altered the original email to say that Mr. Page had not been a source — a material change to a document used in a federal investigation.
The agent relied on the altered email to submit the application seeking further court permission to wiretap Mr. Page, the inspector general wrote. By changing the email and then forwarding it, Mr. Clinesmith misrepresented the original content of the document, which prosecutors said was a crime.
Mr. Clinesmith’s argued that he did not change the document in an attempt to cover up the F.B.I.’s mistake. His lawyers argued that he had made the change in good faith because he did not think that Mr. Page had been an actual source for the C.I.A.
Mr. Clinesmith’s lawyers also argued that their client did not try to hide the C.I.A. email from other law enforcement officials as they sought the final renewal of the Page wiretap. Mr. Clinesmith had provided the unchanged C.I.A. email to Crossfire Hurricane agents and the Justice Department lawyer drafting the original wiretap application.
Mr. Clinesmith had also urged investigators to send any information about an informant’s meeting in October 2016 with Mr. Page, including any exculpatory statements, to the Justice Department lawyer drafting the wiretap application. Mr. Clinesmith said this was “probably the most important” information to provide to the lawyer drafting the wiretap application.
Mr. Clinesmith was among the F.B.I. officials whom Mr. Mueller removed from the Russia investigation after Mr. Horowitz found messages they had exchanged expressing political animus against Mr. Trump. Shortly after Mr. Trump’s election victory, Mr. Clinesmith texted another official: “I honestly feel like there is going to be a lot more gun issues, too, the crazies won finally. This is the tea party on steroids. And the GOP is going to be lost.”
In another text, he wrote, “viva le resistance.”
Mr. Clinesmith told the inspector general that he was expressing his personal views but did not let them affect his work.
Mr. Clinesmith also argued against the prospect of wiretapping another former Trump campaign adviser, George Papadopoulos, who served two weeks in jail on a charge of lying to the F.B.I., according to the Horowitz report. The inspector general said the bureau never sought to surveil him.