A group of Democratic lawmakers Thursday sent a letter to FCC Chairman Tom Wheeler, urging the Commission to engage in cautious oversight of LTE technologies being deployed in unlicensed spectrum. U.S. Senators Brian Schatz , Richard Blumenthal , Tom Udall , Ed Markey , Maria Cantwell , and Claire McCaskill are recommending the FCC initiate a process to develop "an effective sharing solution" to accommodate incumbent unlicensed technologies like Wi-Fi.