The federal court system in America has three main levels; first, the level known as district courts (also called trial court), second, circuit courts which are the first level of appeal, and finally, the Supreme Court of the United States, the final level of appeal in the federal system.
Regarding the first level of the U. S. Federal court system, the district or trial courts, it corresponds to the general trial courts of the federal court system. Each of these trial courts has one United States District Judge, appointed by the President and who is also confirmed by the Senate.
Such district courts are the ones which handle trials, both civil and criminal, within the American federal court system.