While the tariffs of 25% on new imported vehicles and many parts do not directly impact used car sales, changes in new vehicle prices affect the used car market.
President Donald Trump has dismissed critics who have asked how many deals he has brokered after he paused some tariffs last month to allow for negotiations.
Trump again slammed Federal Reserve Chair Jerome Powell after the central bank held interest rates steady as it tries to navigate fallout from White House trade policies.
Trump and his team were touting all the countries eager to make deals with the U.S. on trade. They changed their tune when it became clear such deals wouldn't materialize quickly.
Transportation Secretary Sean Duffy will announce a major upgrade plan for the U.S. air traffic control system that could require Congress to approve billions in additional funding.
The slowdown comes in the wake of revelations that the tower at Newark Liberty International Airport has lost contact with multiple planes in the past year.