The Supreme Court on Thursday signaled deep uncertainty over how, or whether, to rein in the growing use of nationwide injunctions, a legal tool that has repeatedly stymied President Donald Trump’s agenda.

During nearly three hours of oral arguments, justices across the ideological spectrum appeared divided on the best path forward. Some expressed skepticism over the sweeping injunctions issued by judges in lower courts, while others raised alarms about what might happen if federal judges lose the power to halt policies that appear unconstitutional fully.