Today at the United Nations, he made that claim come true. Matthew Choi at Politico:
World leaders laughed Tuesday after President Donald Trump said in a speech to the United Nations General Assembly that his administration had accomplished more than any other in American history.
"In less than two years, my administration has accomplished more than almost any administration in the history of our country," Trump said near the start of a speech before the assembled world leaders, prompting audible laughter.