The phrase "a solid case that" is correct and usable in written English.
It can be used when presenting a strong argument or justification for a particular point or claim.
Example: "The research provides a solid case that climate change is significantly impacting global weather patterns."
Alternatives: "a strong argument that" or "a compelling case that".
It's titled, "Trump Seriously". In it, the writer makes a solid case that Trump is a man in possession of some particularly timely political gifts.
And it is a pity, because Mr Cornwell, a professional historian, thoughtful Catholic and vivid writer, has a solid case that he spoils by intemperance.
US officials have said that there is a "solid case" that the plane was shot down by a missile fired by pro-Russian forces in the region.
He makes a solid case that the best thing for Mr. Sarbanes' young dropout and others like him is to ensure that the long expansion is not poisoned by an outbreak of inflation.
You can make a solid case that the king most of us have never heard of rivaled David: He carried out reforms that cemented the ideas of the religion we moderns now call Judaism.
There has been no dearth of books about America's royal family, but this one makes a solid case that the ur-Kennedy was the most fascinating of them all.
Very few people believe or can make any solid case that dot-com will lose its majority status (myself included).
Statistics show that consumers are 60% more likely to spend when a social benefit is attached to a potential purchase, making for a rock solid case that contributing to the greater good isn't just a boost for the image...it's also great for business.
Filmmaker Andrew Jarecki's HBO miniseries The Jinx made a pretty solid case that extremely creepy real estate scion Robert Durst had a hand in multiple killings.
The 17-page report makes a rock solid case that "constructing Keystone XL will lead to tar sands industry expansion, and tar sands industry expansion will significantly exacerbate climate pollution".
Timothy Noah, for one, has been making a solid case recently that Romney's been giving himself too much credit — that it's not actually that hard to run an Olympics, even one that had been tainted by scandal.
