The justices heard arguments over whether oil companies sued by Louisiana could move the cases from state to federal court, a venue thought to be friendlier to corporate interests.
The Supreme Court on Tuesday will hear a case that could affect laws in 27 states that bar transgender athletes from joining girls' and women's sports teams.
Democratic presidential candidate Joe Biden launched his first major advertising blitz in six battleground states on Thursday as he intensified his effort to defeat President Donald Trump in November's election.
