No he wasn't, He could conclude anything he wanted to. It was a report. Not an indictment. AND it is neither legality OR constitutionality that prevented the justice department from INDICTING a President and nothing prevents a special counsel from concluding that a president committed a crime in a special counsel report. That was the BS narrative created to distract from the fact that Muellar didn't find any crimes by the president.
Just the first thing I run across on point in a google search. Not the Constitution or the law. It is a justice department policy. Something they made up themselves.
"The U.S. Justice Department has a decades-old policy that a sitting president cannot be indicted, indicating that criminal charges against Trump would be unlikely, according to legal experts....
WHAT IS THE JUSTICE DEPARTMENT POLICY?
In 1973, in the midst of the Watergate scandal engulfing President Richard Nixon, the Justice Department’s Office of Legal Counsel adopted in an internal memo the position that a sitting president cannot be indicted. Nixon resigned in 1974, with the House of Representatives moving toward impeaching him.
“The spectacle of an indicted president still trying to serve as Chief Executive boggles the imagination,” the memo stated.
The department reaffirmed the policy in a 2000 memo, saying court decisions in the intervening years had not changed its conclusion that a sitting president is “constitutionally immune” from indictment and criminal prosecution. "
Can a sitting U.S. president face criminal charges? | Reuters
Investigating and reporting on crimes to congress is the very purpose of special counsels. Ken Starr had a long list of indictments and prosecutions of crimes by others, and a report to Congress without any prosecution of the crimes committed by Clinton, including obstruction of justice.