The phrase "always asserted that" is correct and usable in written English.
It can be used when discussing someone's consistent claims or beliefs about a particular topic or issue.
Example: "The scientist always asserted that climate change is primarily driven by human activity."
Alternatives: "consistently claimed that" or "has always maintained that".
It confirms what we've always asserted, that there is no evidence to support the claim".
Iran, which has always asserted that its nuclear program is strictly for peaceful purposes, denounced the report as a fabrication created under pressure from its Western enemies.
Mohamed al-Fayed, the Egyptian businessman whose son Dodi died along with Diana, has always asserted that intelligence agencies were involved.
The administration had always asserted that the C.I.A.'s pressure tactics did not amount to torture, which is banned by federal law and international treaty.
She always asserted that her readership was small, though Jigsaw was a runner-up for the Booker prize, and its success meant that her novels became a minor cult.
Ms. Goodwin, now a critically acclaimed biographer of historical figures like Abraham Lincoln and Franklin D. and Eleanor Roosevelt, has always asserted that her relationship with Johnson was not sexual, and that she sat in a chair while he unburdened himself from her bed.
(Some wise guy always asserts that Howard is somehow an example of reverse racism.
Defenders of the electoral-college status quo always assert that it's good for the little guys.
While some states have given regulators explicit authority to take an aggressive stance with a utility provider and its affiliates, Montana has not, Mr. Rowe said, though he added, "We always assert that we do have that authority".
I will always assert that an adult has the right to purchase any piece of artwork they desire, but in the case of "The BBFC v Human Centipede II," I can see where the censors are coming from.
Even in incidents where people died and regulators cited companies for willful violations -- defined by OSHA as those that involve either an intentional flouting of the law or "plain indifference" to it -- companies almost always assert that the tragedies were unforeseeable.
