THE Supreme Court's conservative justices signaled support for U.S. presidents having some level of protection from criminal charges for certain acts taken in office as it tackled Donald Trump's claim of immunity from prosecution for trying to undo his 2020 election loss. During about 2-1/2 hours of arguments in the case, most of the justices seemed unlikely to embrace Trump's most far-reaching argument that presidents have "absolute immunity" for official acts - an assertion that appeared to wilt under hypothetical questions involving selling nuclear secrets, taking a bribe or ordering a coup or political assassination. But the conservative justices, who hold a…