Why does almost anyone have more credibility than an American president by the name of Trump??

 https://en.wikipedia.org/wiki/Veracity_of_statements_by_Donald_Trump

During his term as President of the United States, Donald Trump made tens of thousands of false or misleading claims; The Washington Post's fact-checker had tallied the number as 30,573, an average of about 21 per day by the end of his presidency.^[1][5][6][7] Characterized as a use of the "firehose of falsehood" propaganda technique,^[8] commentators and fact-checkers have described the scale of his mendacity as "unprecedented" in American politics,^{[9][10][11][12][13]} and the consistency of these falsehoods became a distinctive part of both his business and political identity.^[14] Trump often denied having made controversial statements.^[15][16] By June 2019, after initially resisting to do so, many news organizations began to describe some of his falsehoods as "lies",^[17] which are false statements that the speaker knows are false. The Washington Post said his frequent repetition of claims he knew to be false amounted to a campaign based on disinformation.^[18] Trump campaign CEO and presidency chief strategist Steve Bannon said that the press, rather than Democrats, was Trump's primary adversary and "the way to deal with them is to flood the zone with shit."^[19][20]

As part of their attempts to overturn the 2020 United States presidential election, Trump and his allies repeatedly and falsely claimed there had been massive election fraud and that Trump had really won the election.^[7] Their effort was characterized by some as an implementation of the "big lie" propaganda technique.^[21]