Washington, Feb. 19 -- Sixteen states on Monday evening filed a lawsuit challenging US President Donald Trump's national emergency declaration.

The group of states, led by California Attorney General Xavier Becerra, filed the lawsuit in the US District Court for the Northern District of California.

"We're going to try to halt the President from violating the Constitution, the separation of powers, from stealing money from Americans and states that has been allocated by Congress, lawfully," Becerra told CNN.

The attorneys general from Colorado, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Michigan, Minnesota, Nevada, New Jersey, New Mexico, New York, Oregon and Virginia joined California in the lawsuit.

It's the latest chall...