Why has the Supreme Court not yet issued a ruling on former President Donald Trump’s presidential immunity claim? MSNBC legal expert Lisa Rubin gave a potential reason why on Thursday evening. The Supreme Court must decide whether to stay the D.C. Circuit Court of Appeals decision, which ruled Trump is not immune from prosecution in his federal election interference case, and whether to review the decision, Rubin noted. “On the one hand, Lisa, I understand the enormity of what it is they’re being asked to reckon with,” said anchor Alicia Menendez. “On the other hand, time is of the essence.” W…