Sen. Elizabeth Warren urged the Federal Communications Commission on Wednesday to enact strong net-neutrality rules to ensure that all websites receive equal service.

"Reports that the FCC may gut net neutrality are disturbing, and would be just one more way the playing field is tilted for the rich and powerful who have already made it," the Massachusetts Democrat wrote in a Facebook post.

"Our regulators already have all the tools they need to protect a free and open Internet—where a handful of companies cannot block or filter or charge access fees for what we do online. They should stand up and use them."

FCC Chairman Tom Wheeler plans to advance net-neutrality regulations that would allow Internet service providers to charge websites for faster service as long as the arrangements are "commercially reasonable." The rules would bar ISPs from blocking any websites or degrading service.