Jay Sekulow said that "witch hunt" might even be a tame term to describe the Russia investigation.
"I'm not sure that's fair to witch hunts," Sekulow remarked. "It's beyond that."
President Trump has called the investigation a "witch hunt" that is distracting from his agenda.
Sekulow said that the Obama administration has "a lot to explain" about its role in the 2016 presidential election, and they "need to do it under oath."
The attorney for President Trump stated that former President Obama ignored information about Russian interference in the election because he thought Hillary Clinton would be the next president.
"We know the administration previously had all the information and did nothing about it," Sekulow said.
President Trump's campaign is currently under investigation by Special Counsel Robert Mueller for allegations of collusion with Russia to influence the outcome of the election. So far no evidence has surfaced to corroborate the accusations.
"Why don't we have a Special Counsel reviewing why President Obama did nothing...?" Sekulow asked.
The Department of Homeland Security said in October Russia had not been successful at interfering in the election.
Sekulow had a few demands of the former president and his staff. Obama should issue an apology to President Trump and the American people.
He also called for both Obama and former Attorney General Loretta Lynch to testify before Congress under oath about their involvement with the 2016 election.