H.R. 6061, the "Secure Fence Act of 2006", was introduced on September 13, 2006. It passed through the U.S. House of Representatives on September 14, 2006 with a vote of 283–138.
On September 29, 2006, by a vote of 80–19 the U.S. Senate confirmed H.R. 6061 authorizing, and partially funding the "possible" construction of 700 miles (1,125 km) of physical fence/barriers along the border. The very broad support implies that many assurances have been made by the Administration, to the Democrats, Mexico, and the pro "Comprehensive immigration reform" minority within the GOP, that Homeland Security will proceed very cautiously. Michael Chertoff, announced that an eight-month test of the virtual fence, he favors, will precede any construction of a physical barrier.