"“They are abandoning people because they are poor."
A strike could hold back the industry at a time when it is benefiting from federal intervention aimed at boosting production and employment.
Republicans are pushing a second round of tax cuts ahead of November's elections, but the projected costs are high.
Charles Rettig could face crucial decisions over President Trump's tax returns and implementing the GOP tax law.
The median U.S. household earned $61,372 in 2017, a record level and a sizable jump from the prior year, the U.S. Census reported Wednesday.
The ranks of the nation's uninsured grew in 2017, though the increase was not statistically significant.
Republicans are pushing to make permanent cuts in the tax law they passed last fall.
The attorneys general are probing contracts that prevent workers from switching franchises, a practice that some economists say drags down wages for millions of Americans.