President Trump promoted his own version of reality in the Oval Office after firing the head of the agency that collects employment statistics last week.

WASHINGTON (AP) — President Donald Trump unexpectedly summoned reporters to the Oval Office on Thursday to present them with charts that he says show the U.S. economy is solid following a jobs report last week that raised red flags and led to the Republican firing the head of the Bureau of Labor Statistics.

How exactly does the BLS assemble the critical jobs report? And what is the commissioner’s role? Here’s what we know.