Protesters have sued the Trump administration to rein in what they describe as an out-of-control response by federal agents to demonstrations in Portland.
The new hold on executions came a day after a federal appeals court lifted a hold on the execution of Daniel Lewis Lee, of Yukon, Oklahoma, which is scheduled for 4 p.m. EDT on Monday.
A federal judge in Idaho blocked the Trump administration plans last year over concerns that they could harm greater sage grouse, a ground-dwelling bird.
It's the third time in three years that the administration is asking the justices to rescue a controversial policy that has been blocked by several lower