Senate Republicans are demanding answers from one of the top officials in President Joe Biden’s administration after the Transportation Security Administration (TSA) acknowledged it lets illegal immigrants use arrest warrants as a form of identification to fly inside the United States. The revelation is “alarming” and presents a potential “serious threat to our nation’s homeland security,” Sen. Thom Tillis (R-N.C.) and nine other senators said in a letter to Department of Homeland Security (DHS) Secretary Alejandro Mayorkas that was obtained by The Epoch Times. TSA, which helps secure U.S. airports, confirmed to The Epoch Times recently that agents accept some DHS-issued forms if non-citizens don’t have identification. That includes Immigration and Customs Enforcement (ICE) form I-200, or warrant for arrest of an alien. That form states that there is probable cause to believe a certain alien is removable from the United States and commands immigration officers to arrest and take into …