He has been repeating that message in the run-up to the mid-term elections in November, when voters choose members of both chambers of Congress, some state governors as well as state and local officials.
According to one estimate by the Washington Post in early September, the president had made the claim - or a variant of it - 40 times in the previous three months.
Reality Check verdict: Yes, the economy has been doing well - but there have been periods when it was even stronger.
And there are some indicators that are less good - such as wage growth in real terms.
The growth in GDP - the value of goods and services in the economy - has been strong.
It reached an annual rate of 4.2% for the second quarter of 2018.
That's the best for several years, but less than the 4.9% achieved in the third quarter of 2014.
And there were times in the 1950s and 1960s when GDP growth was even higher.
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