It needed a better motivating factor to go tabloid
Like if the journalists involved said "he's another made for tv president, but he's a fraud, and his policies will lead this country to economic ruin or war, so let's take him down", then I could get behind the journalists and their quest.
But I didn't get a great motivating factor.
Instead, we ended up getting some "oh this cheater is standing up for the line in the sand between public and private lives, bravo". It was preachy, and even his motivation for dropping out was weak. A phone conversation we barely see or hear?
So I'm giving this movie a C.