The US government is allowed to order four death sentences previously suspended by a Washington court at the last minute.
The US Supreme Court put an end to that decision on Tuesday, paving the way for its execution.
It involves the execution of four murderers who were sentenced to death by a national (federal) court. These are the first executions at the federal level since 2003.
The first execution was scheduled for Monday, two others later this week and one next month.
The lower court ruled that more time was needed to handle complaints against the lethal injections and postponed the executions until further notice. The Supreme Court disagreed.
After a seventeen-year hiatus, President Trump and the Justice Department want to step up their strict justice policies with the resumption of the death penalty.
Federal executions are rare. The only three since 1963 were in the years 2001 to 2003, including the execution of the offender of the 1995 Oklahoma City bombing, Timothy McVeigh.
Some of the U.S. states have continued to carry out executions of individuals sentenced to death in their own courts, such as Texas, in recent years. The death penalty has been eradicated in over twenty states.