The phrase "assert when" is correct and usable in written English.
It can be used when indicating a specific condition or time under which something is claimed or stated to be true.
Example: "The researcher will assert when the data supports the hypothesis."
Alternatives: "claim when" or "declare when".
One might have been tempted to assert, when personal computers first appeared in the market around 1980, that Digital's core capability was in building computers.
But Israel tried that with Hezbollah in Lebanon and failed, leaving Hezbollah leaders to assert when the war was over that they had stood up to Israel.
This is what Holocaust deniers assert when confronted with camp survivors, and it was what apologists for Stalinism asserted when faced with veterans of the gulag.
But all will travel from point A to point B. In contrast, and despite what conservatives assert, when patients need care there are rarely low-, medium- and high-cost options; the choices tend to be black and white.
And such women are "dangerous," the ads assert, when it comes to spending freely — not only on their weddings, but also afterward, in categories like automobiles, electronics, financial services, home goods and travel.
In it Newton says he can't see any reason why the world would end before 2060, "it may end later, but I see no reason for its ending sooner", and explicitly states "this I mention not to assert when the time of the end shall be".
RGB is never asserted when sync active low.
RGB is only asserted when Tri-state enabled low.
But, he asserted, "when it comes to health care, it's a mess in Texas".
The Gingrich grandiosity was on display, King asserted, when the new frontrunner "compared his wife to Jacqueline Kennedy and Laura Bush and Nancy Reagan".
FCA did not disclose the software to regulators, the EPA asserted when it first announced its accusations.
