wrongly claimed that unemployment was as high as 42% instead of the official 5.1%?

In 2015, Trump said the official unemployment figure of about 5% was “such a phony number.” claiming it to be around 20%.

After winning election, he used the same official metrics he derided as “phony” to boast about his positive impact on the economy.

NPR – Ahead Of Trump’s First Jobs Report, A Look At His Remarks On The Numbers
Politifact – Donald Trump says the unemployment rate may be 42 percent