House Energy and Commerce Committee Chairman Fred Upton is expanding his investigation into the meetings between special interest groups and the Obama White House that set the stage for the passage of Obamacare, sending document requests to 12 industry groups and unions that played a key role in the negotiations. In April 18 letters to the groups, Upton asks for extensive details and documents about each organization's interactions with the White House in regards to the healthcare law. The requests come as the Obama White House has so far declined to provide its documents about the meetings. At issue are special deals struck between interest groups and President Obama to either garner the support of major industry sectors or soften their criticism of the healthcare law.