President Donald Trump speaks to thousands at a April 29, 2017 "Make America Great Again" rally in Harrisburg, PA.

Although Donald Trump likes to brag about how much the labor market has improved since he took office, economists say it's too early to make that claim — while a series of abrupt reversals on policy positions could be putting a drag on the economy's momentum and actually undermining labor market growth.

Although the official unemployment rate, which dipped to 4.5 percent in March, had been hovering fractions of a percentage point below 5 percent for a number of months, economists were cheered by improvements in other measures of labor market health: The labor force participation rate has been ticking up, and the broader measure of unemployment that includes those "discouraged" and "marginally attached" to the job market, as well as people stuck in part-time jobs who want to work full-time, dropped below 9 percent in March, the lowest that figure has been since the end of 2007.