Conservative firebrand Ann Coulter called President Trump “lazy and incompetent” and a “lunatic” and warned that he could face a Republican primary challenger from the right if he doesn’t fulfill his promise to build a wall across the Mexican border. “We put this lunatic in the White House for one reason. Instead, Coulter claimed, he can simply use his inherent authority as commander in chief to direct that the wall be built in order to “protect” United States citizens and “defend” the country from illegal immigrants. “He doesn’t need to declare an emergency” to build the wall, Coulter said, claiming...