Sen. Elizabeth Warren D-Mass., and Sen. Mark Kelly, D-Ariz. Michael M. Santiago | Tom Williams | CQ-Roll Call, Inc. |Getty Images Despite President Donald Trump’s promises of a manufacturing boom in his second administration, two Democratic senators are arguing in a letter to the administration — and shared first with CNBC — that the president’s policies have created more hardship for U.S. workers. Sens. Elizabeth Warren, D-Mass., and Mark Kelly, D-Ariz., wrote on Monday to U.S. Trade Representative Jamieson Greer, Treasury Secretary Scott Bessent and Commerce Secretary Howard Lutnick, questioning Trump’s trade policy and asking all three to explain the country’s growing trade deficit on manufactured goods.  “Blue-collar jobs are disappearing, a trend that economists blame at least in part on the president’s historic and volatile tariff policy,” the lawmakers wrote. “The Trump Administration’s trade agenda has favored the interests of wealthy corporations and Trump allies, leaving manufacturing workers behind.” Read more CNBC politics coverage Spokespeople for Greer, Bessent and Lutnick did not immediately respond to a request for comment. Kelly and Warren have both …