A simple assertion of fact is usually criticized in the comments. (epolitics.com)
But as journalism, its analysis and conclusions should rest as often as is possible on some form of original reporting or on peer - reviewed or government - sponsored research to back up significant assertions of fact. (academic.oup.com)
In British Chiropractic Association v Dr Singh [2010] EWCA Civ 350, the court held that Singh's comments were expressions of opinion not assertions of fact. (newlawjournal.co.uk)