While President Donald Trump on Monday hailed a tentative trade deal with Mexico, U.S. Sen. Marco Rubio, R-Fla., and U.S. Sen. Bill Nelson, D-Fla., raised concerns about whether the deal would adequately protect Florida farmers. Rubio and Nelson sent a joint letter to U.S. Trade Representative Robert Lighthizer requesting that he work “diligently to ensure Florida’s agriculture community is fairly …