When a car won't shift into reverse or drive, the driver should open the hood to check the transmission fluid level. The precise procedure varies from one model to another, so it is necessary to consult the vehicle's manual for accurate instructions.
The judicial branch can declare laws passed by Congress or executive acts by the President of the United States unconstitutional, thus legally voiding them. However, all federal judges are nominated by the president and approved by the Senate. Additionally, Congress can remove a federal judge from office by impeachment.
Quick Answer. Once passed by the legislature and signed into law by the president, the people of the United States can challenge any law in the courts under the authority of the judicial branch. Laws deemed unconstitutional by the judiciary are considered void.