Washington (AP) – The Supreme Court is leaving in place a decision that rejected environmental groups’ challenge to sections of wall the Trump administration is building along the U.S. border with Mexico. The high court on Monday declined to hear an appeal involving construction of 145 miles of steel-bollard walls along the border in Texas, new Mexico, Arizona, and California. Environmental groups had challenged a federal law that allows the secretary of Homeland Security to waive any laws necessary to allow the quick construction of border fencing. Environmental groups argued that waiver violates the Constitution’s separation of powers. But a lower court dismissed the case.