As reported by the Associated Press:

A key member of the Senate Judiciary Committee is asking the nation’s top four wireless carriers to justify the “sharply rising rates” they charge people to send and receive text messages.

In letters to top executives at Verizon Wireless, AT&T Inc., Sprint Nextel Corp. and T-Mobile, Wisconsin Democrat Herb Kohl said Tuesday that he is concerned that rising text messaging rates reflect decreasing competition in the wireless business.

Kohl chairs the Judiciary Subcommittee on Antitrust, Competition Policy and Consumer Rights. His inquiry comes as European Commission regulators are threatening to impose a cap on roaming fees for text messages sent by Europeans traveling outside of their home nations, in an effort to force prices down by as much as 70 percent.