More trouble for old John:

A federal grand jury in Washington, D.C. has issued document subpoenas to at least a half-dozen Nevada companies with ties to Sen. John Ensign (R-Nev.), a sign that the criminal probe into Ensign’s romantic relationship with a former aide is accelerating.

The existence of the subpoenas was first reported by KLAS-TV in Las Vegas.

The TV station said Justice Department investigators “came to Las Vegas with a fistful of subpoenas to serve on local businessmen who have had dealings with Senator Ensign or his staff since January 2008. The team consisted of a special agent from the FBI and a prosecutor from the Criminal Division, Public Integrity Section of the Department of Justice.”

And yet John gets to remain sitting as a U.S. Senator.