Federal court judge Jeffrey T. Miller toured the Tijuana River Valley for several hours on Tuesday to observe pumps and canyon collectors along the border intended to prevent sewage from spilling into San Diego. The unusual move comes as the result of a contentious legal battle in which Miller must decide whether the Trump administration is doing enough to stop sewage that routinely pours into the United States from Mexico. The cities of Imperial Beach and Chula Vista, as well as the Port of San Diego, sued the federal government in March, alleging violations of the Clean Water Act and the Resource Conservation and Recovery Act.