WASHINGTON/NEW YORK (Reuters) - Conflicting signs from the White House have left brokerage firms and lobbyists unsure whether a controversial rule governing retirement advice will ever be put in place, but they are taking no chances and complying anyway. President Donald Trump's Friday memorandum ordered the Labor Department to review the so-called "fiduciary" rule, which requires brokers to put their clients' interests first when advising them about 401(k) plans or individual retirement accounts. Trump's memo did not go as far as White House early guidance to reporters that the memo would ask the department to "defer implementation" of the rule.