continued to do so in 2020, but I don't recall Hillary claiming election fraud or saying the election was stolen from her. In fact I remember Hillary conceding, somewhat graciously:

“We have seen that our nation is more deeply divided than we thought. But I still believe in America and I always will. And if you do, then we must accept this result and then look to the future. Donald Trump is going to be our president. We owe him an open mind and the chance to lead.

“Our constitutional democracy enshrines the peaceful transfer of power and we don't just respect that, we cherish it. It also enshrines other things; the rule of law, the principle that we are all equal in rights and dignity, freedom of worship and expression. We respect and cherish these values too and we must defend them.”

And what reason do you have to have little doubt about the validity of this election? When it is all said and one, Biden will have received more than 6 million more votes than Trump. And the states that were close all have republican legislatures that determine the rules for counting votes. Please offer plausible reasons for questioning the validity of this election with evidence.