Donald Trump, having propelled his presidential campaign to victory while often disregarding the truth, now is testing the proposition that he can govern the country that way.
In the first five days of his presidency, Trump has put the enormous power of the nation's highest office behind spurious - and easily disproved - claims.
He began with trivial falsehoods about the size of the crowds at his inauguration but has since escalated a more grave claim that undermines the trustworthiness of the nation's electoral system.
In a White House reception for congressional leaders, Trump alleged that as many as five million undocumented immigrants voted in the 2016 election, denying him a popular-vote majority. It was a claim that Trump had made in the aftermath of the election, with no evidence to back it up.
Beliefs are not the same as facts. Trump's attraction to conspiracy theories and his contempt for facts that tarnish his pride may have serious implications for his ability to govern.