The federal government is in charge of managing interstate commerce under the Commerce Clause of the Constitution, so legally CA probably doesn't have the righ

The federal government is in charge of managing interstate commerce under the Commerce Clause of the Constitution, so legally CA probably doesn't have the right to close its borders (this was used in Katzenbach v McClung as legal justification for the federal government banning seperate whites and colored sections in restaurants https://en.wikipedia.org/wiki/Katzenbach_v._McClung https://en.wikipedia.org/wiki/Katzenbach_v._McClung). Additionally some of the border traffic is for critical items such as food, medical supplies, gas, etc.