Boxer has said she will hold a hearing in July on the issue.
The California Democrat is not the only obstacle to the measure. Environmental groups have raised concerns about the Lautenberg-Vitter bill, saying it doesn’t go far enough in instituting new protections.
In a statement issued in May, Environmental Working Group President Ken Cook said: “Gone from the bill are all the vital provisions that gave the public hope that Congress would stand up to chemical companies and toughen federal safeguards specifically to protect infants, children and expectant mothers from the toxic industrial chemicals all around us. From its findings and policy goals straight through to its regulatory provisions, this bill falls far short of meeting the pressing need to protect public health and the environment.”
Vice President Joe Biden waits to conduct a mock swearing-in ceremony with Sen. Brian Schatz, D-Hawaii, in the Capitol's Old Senate Chamber, December 2, 2014. Schatz was sworn in to serve the remainder of his term since he was appointed to the seat after Sen. Daniel Inouye, D-Hawaii, passed away.