Vice President Joe Biden said Wednesday the U.S. military will chase ISIS to "the gates of hell," though an Aquinas College chair says it's not that easy.

The vice president responded to criticism the White House isn't doing enough to address the threat from the Islamic State of Iraq and Syria, the group behind the beheading of American journalists Steven Sotloff and James Foley.

"We will follow them to the gates of hell until they are brought to justice," the vice president said.

His comments follow criticism the White House is too lenient with its response to ISIS.  Sen. John McCain, R-Ariz., said in the weekend CBS broadcast of "Face the Nation" the group "must be defeated, not contained."

Dr. Roger Durham, chairman of the political science department at Aquinas College, said the rhetoric may not match the reality.

"This group has no credibility whatsoever [and] they're violating international law," he said in a Wednesday interview with WOOD Radio News. "But it's important for the United States to work together with other countries to respond to this."

Durham said U.S. legitimacy waned with its strategy in Iraq during the Bush administration, but it now has an obligation to lead on moral grounds.

"This is a particularly good opportunity for the Obama administration to lead in responding very illegal acts," he said.

ISIS was condemned Monday for their barbarism in separate reports from Amnesty International and Human Rights Watch.