The phrase "and asserted that if" is correct and usable in written English.
It can be used when introducing a statement or claim that is conditional in nature, often followed by a specific condition or scenario.
Example: "She presented her findings and asserted that if the data were accurate, the results would support her hypothesis."
Alternatives: "and claimed that if" or "and stated that if".
Instead, they assume, and assert, that if, say, Geithner is against nationalizing the banks, he is either stupid or corrupt, when it seems more likely that he's just reached a different conclusion about the risks and rewards of nationalization.
Lamenting the horrors of the war, Goldfield computes its total monetary cost at around $6.7 billion in 1860s currency, and asserts that if "the government had purchased the freedom of four million slaves and granted a 40-acre farm to each slave family, the total cost would have been $3.1 billion, leaving $3.6 billion for reparations to make up for a century of lost wages.
However, Fulljames does make one major qualification: he sees Mahagonny responding to capitalism as a cyclical process and asserts that if the city of rampant pleasure and concomitant commoditisation is currently to be found anywhere on earth, it's in China, which he describes as being "at the beginning of the story".
Both plans were based on a rejection of the old laissez-faire notion that if economies were left to their own devices they would automatically return to full employment, and asserted that capitalism, if it were to survive and prosper, would need to be actively stabilized.
A similar attack appeared in Le Monde, where Christian Salmon, a writer and researcher, asserted that if Jacques Chirac had sedated French society, Mr. Sarkozy had rendered its political life hysterical.
The banks are so large and important, he asserted, that if the country allowed them to fail, everyone would suffer.
In a paper* published last year, George Akerlof of the University of California and William Dickens and George Perry from the Brookings Institution asserted that, if inflation were zero, money illusion and other factors that make nominal wages difficult to cut would cause a substantial, and permanent, increase in American unemployment.
In his interview with ABC White House reporter Jon Karl on Saturday, Sekulow, a longtime Trump ally and a member of his personal legal team, asserted that if Veselnitskaya and Akhmetshin were such concerning figures, the Secret Service should have prevented them from entering Trump Tower.
By 1957, von Braun was America's rocket guru, and he confidently, almost casually, asserted that if America wanted a satellite of its own, he could send one up tomorrow.
