"As the We the People Terms of Participation explain, to 'avoid the appearance of improper influence,' the White House may decline to address certain procurement, law enforcement, adjudicatory, or similar matters properly within the jurisdiction of federal departments or agencies, federal courts, or state and local government," an official response to the petition said.
"That's why we're declining to comment on the specific request raised in this petition," the White House said.
Siddiqui is a US trained scientist serving 86 years in Fort Worth Federal prison in Texas after being found guilty of attempted murder of US Army officers and FBI agents in 2010.