As defined by Lexico, the Big Lie technique is
A gross distortion or misrepresentation of the facts, especially when used as a propaganda device by a politician or official body.
As explained on Wikipedia:
The German expression was coined by Adolf Hitler, when he dictated his 1925 book Mein Kampf, to describe the use of a lie so "colossal" that no one would believe that someone "could have the impudence to distort the truth so infamously." Hitler claimed the technique was used by Jews to blame Germany's loss in World War I on German general Erich Ludendorff, who was a prominent nationalist political leader in the Weimar Republic.
The term has recently been used in reference to false claims of election fraud in the 2020 US presidential election. Again from Wikipedia:
To support his attempts to overturn the 2020 United States presidential election, President Donald Trump and his allies repeatedly and falsely claimed there had been massive election fraud and that Trump had really won the election. U.S. Senators Josh Hawley and Ted Cruz subsequently contested the election results in the Senate. Their effort was characterized as "the big lie" by then President-elect Joe Biden: "I think the American public has a real good, clear look at who they are", Biden said two days after the Capitol was attacked. "They're part of the big lie, the big lie.
The linked Wikipedia page goes on to list other occasions of the term being used in reference to the 2020 election, for example in the impeachment proceedings.
Have these politicians elaborated on their usage of this historically loaded terminology?