Well, in 2016 Hillary Clinton had a 2.6 million majority in the popular vote, yet lost the election to Trump. And there was a valid argument that because Trump had not received as many votes as Clinton, he did not have the mandate to govern.
In 2020, Joe Biden won the election with a majority of 8 million in the popular vote. Having lost the election to Biden, Trump and his team made all manner of spurious claims of election fraud and rigging. No valid evidence was ever produced to support these claims. The result of the election was clear - not only did Trump lose, but he had no claim on the popular vote. He had no mandate.
In the 2024 election Trump polled some 2.5 million votes more than Harris. Not only did he win the electoral college vote, he could also legitimately claim to have won the popular vote. It is true that Trump did not attract more than 50% of the votes cast - which was due to the presence of other candidates in the ballot - but he nevertheless gained more votes than any other candidate. By the rules of the U.S. electoral system, Trump won, fair and square. By the U.S. rules, he has the mandate to govern.
That’s a bitter pill to swallow for those of us who believe in democracy. We have no choice but to suck it up, because, whilst democracy is imperfect, it’s a lot better than any of the alternatives.
The sad fact is that in the U.S., Democrat voters are concentrated in certain areas, whereas Republican voters are more randomly scattered - and this skews the voting system.
If you wanted to calculate a true, representatitve, mandate, you would have to compare the votes cast for a candidate to the total number of people eligible to vote, not just the number who turned out at a particular election. And by this metric, I suspect you would find that no President has ever had an overall mandate.
I think the highest voter turnout the U.S. had seen in postwar years was in 1960, when John F Kennedy gained 34 million votes. But at the time, the total eligible voting population was 108 million. Kennedy won, yet 74 million eligible Americans did not vote for him.
I know there are people complaining that Trump did not win more than 50% of the vote, but that’s not how the U.S. system works.