The phrase "argues firmly" is correct and usable in written English.
It can be used when describing someone who presents their viewpoint or opinion with conviction and strength.
Example: "In her essay, she argues firmly that climate change is an urgent issue that requires immediate action."
Alternatives: "asserts strongly" or "contends decisively".
Meanwhile, President Nicolás Maduro argues firmly he is the legitimate leader.
Mr. Lindert argues firmly that under comprehensive public health programs, people are healthier and live longer, which also makes them more productive.
Saadya upholds the absolute unity of God, and argues firmly for creation ex nihilo.
At the time he argued firmly that the shroud, which bears a Christlike image, was a clever forgery.
Just as I have argued firmly for compassion and fairness in life, I believe that terminally ill people should be treated with the same compassion and fairness when it comes to their deaths.
"Just as I have argued firmly for compassion and fairness in life, I believe that terminally ill people should be treated with the same compassion and fairness when it comes to their deaths," he added.
Tao argued firmly for the former and has relished the opportunity.
Where Beowulf does deal with specific tribal struggles, as at Finnsburg, Tolkien argued firmly against reading in fantastic elements.
China has been particularly adamant that its participation in RIMPAC should not be easily dismissed; a Xinhua commentary argued firmly that the RIMPAC drill was "not window-dressing for China-U.S. ties".
We have now gained confidence and we are able to argue firmly in front of the chairperson.
I would argue quite firmly that if anyone deserves to spark up a fat one, it's Eric, whose mining career was interrupted first by a stint in the army and later by a physically taxing one in the building trade.
