Sen. Hillary Clinton and Rep. Jerrold Nadler said in a statement that they will "conduct companion hearings into the failures of the federal government in responding to the environmental crisis that resulted" from the buildings' collapse, which spewed hundreds of tons of potentially toxic dust into the air of lower Manhattan.

Clinton is chair of the Senate Environment and Public Works Subcommittee on Superfund and Environmental Health, while Nadler chairs the House Judiciary Subcommittee on the Constitution, Civil Rights and Civil Liberties.

Read More From UPI [1]