The Texas-based engineering construction company argued that it could not be sued because it was working during wartime for the government.
The case involves tariffs first announced in April on almost all U.S. trading partners and the ones from February on Canada, China and Mexico.
President Trump returns to power after an unprecedented comeback, emboldened to reshape American institutions.
The Supreme Court could temporarily put the law on hold so that they can give fuller consideration to First Amendment and other issues.
The majority did not explain their reasoning in a brief order on Monday declining to take the case.
Investigators 'conducted 126 formal interviews of 97 employees, all of whom denied disclosing the opinion,' the court said.
Roberts’ order Tuesday gives the Supreme Court time to weigh the legal issues in Trump’s emergency appeal to the high court.
President Biden says people should be peaceful when protesting the Supreme Court opinion that would allow states to ban abortion.
Thomas had entered the hospital last Friday evening after experiencing 'flu-like symptoms.'
Chief Justice John Roberts administered the oath Tuesday morning at the court.