Seven Democratic lawmakers sent a letter to the Department of Homeland Security inspector general to initiate investigations into federal contracts being awarded to Ingersoll Rand, a company that inverted in 2001.  Under federal law, companies that have used tax-avoidance strategies are not eligible to compete for and win federal contracts to sell products and services to the U.S.  The letter was signed by Rep. Rosa DeLauro (D-CT), Rep. Lloyd Doggett (D-TX), Sen. Dick Durbin (D-IL), Rep. Sander Levin (D-MI), Sen. Jack Reed (D-RI), Sen. Sheldon Whitehouse (D-RI), and Sen. Elizabeth Warren (D-MA).