The U.S. Department of Justice sent a letter to House and Texas Senate leaders Tuesday -- reportedly in person -- threatening a shut-down of airports if HB 1937 is passed. The letter claims Rep. David Simpson's (R-Longview) anti-TSA-groping bill is against federal law and the Supremacy Clause of the U.S. Constitution. We include the text of the DOJ's letter, as well as a portion of Simpson's reply, below.