Never mind that the heretofore unthinkable act of an American President calling off an election so that he can hold on to power is illegal and unconstitutional; since when has illegal or unconstitutional behavior mattered for Donald Trump? During his presidency he's gotten away with hiding his financial assets, making money from business dealings with foreign entities, obstructing justice, attempted extortion of a foreign leader, and calling on foreign governments for help in defeating a political opponent, to name a few. He's gotten away with flagrant disregard for the laws of our country and the laws of human decency every day that he's held the office of President of the United States.
But the only reason Donald Trump gets away with breaking the law and violating the United States Constitution is because the people whose duty it is to uphold our laws and protect our Constitution, that is, the members of Congress,
And so, though Donald Trump really has no power to do anything by himself, if the members of Congress who've been enabling him and empowering him opted not to stop him from cancelling the election, then what would stop him from cancelling the election?
For me and, I'm sure, for millions of other Americans, it was a frightening moment when Donald Trump verbalized - twitterized - the idea of delaying our Presidential election under the guise of promoting election security. Because words are the first step to making a thing happen, and Trump had now said the words.
Thank God members of Congress, even Trump's strongest allies there, immediately rose up as one to declare that under no circumstances would the 2020 American Presidential election be postponed to any other date than November 3, the Tuesday after the first Monday in November, in accordance with the law of our country. The Trump tweet that so much as hinted at the idea of tampering with our election was a tweet too far and this time not even his most sycophantic defenders would defend him.
https://www.nytimes.com/2020/07/30/us/politics/trump-delay-election.html
https://www.yahoo.com/huffpost/fox-news-politics-editor-donald-trump-election-delay-072542343.html