Doggett, who represents part of Austin, called the attack an "act of domestic terrorism" and compared it to the Oklahoma City bombing.
“Like the larger-scale tragedy in Oklahoma City, this was a cowardly act of domestic terrorism," Doggett said in a statement. "Stack’s apparent website message reflects the steadily increasing flow of ‘the government is out to get me’ paranoia."
Joe Stack, the man responsible for the attack, left a suicide note laced with criticism against higher taxes.
Doggett also criticized a Facebook group where people had become "fans" of the attack.
"That so many have already contributed to a Facebook page as ‘fans’ of this terrorist attack on public servants is a truly appalling expression of extremism, which Americans will overwhelmingly reject," he said.