It is not acceptable to postpone a presidential election. If you're a reporter, please get Republican members of Congress & the executive branch on record on that. There has to be a red line, even for Trump supporters. If this isn't it, I can't imagine what would be.
Nor is it Constitutional. Under Article II, §1, cl. 4, Congress sets the date for the election & also for the Electoral College vote. The text of the Constitution doesn't give the President any power to alter that decision.
If you want to read more, after 9-11, the CRS looked at whether the dates of Presidential/Senate/House Rep elections could be moved if there was another terrorist incident. Their report concluded the power to set the date ultimately resides with Congress. fas.org/sgp/crs/RL3247…
Trump's term in office ends on January 20, 2021. There is no provision to extend it if there isn't an election before then. In that unlikely case, the new President would be determined by the succession provisions, so not the VP (term also expired), likely Speaker of the House.
