Ah, but whether it is a "reasonable" pretext/excuse for suspending elections is up to the media and how they want to spin it for the masses, to shape their opinion, isn't it? And how practical, that more news outlets are now owned by MAGA people. Furthermore, I will not put it past Trump to use any flimsy excuse to suspend elections, if he thinks he will lose.
Can you name something which can't be spun by the media or that you could not believe Trump would try to use as an excuse? If something is always true, it is evidence of nothing in particular.
Claiming this strike on Iran is an attempt to suspend US elections is exactly as ridiculous as claiming the last round of strikes on Iran, or the Maduro raid, or any of Trump's other previous military boondoggles were attempts to suspend US elections.
The president has no legal powers over elections, per the constitution. Only states can hold elections.
Of course Trump and the GOP can try all sorts of voter suppression, which is what they're doing now.