President Trump issued a challenge to Congress, particularly Senator Lindsey Graham, urging them to call Barack Obama to testify about a slew of wrongdoings revealed in recent days.

Graham, the Senate Judiciary Chairman whose panel is investigating the origins of the 2016 Russia investigation, indicated earlier this week he would be calling former senior Obama administration officials as witnesses.

New developments have the President fired up, however, demanding more. Much more.

“If I were a Senator or Congressman, the first person I would call to testify about the biggest political crime and scandal in the history of the USA, by FAR, is former President Obama,” Trump tweeted Thursday. “He knew EVERYTHING.”

RELATED: Trump Calls For Jail Time For Obama Officials, Says Unmasking Is Greatest Political Crime in History

No More Mr. Nice Guy

The President chided Graham saying, “No more Mr. Nice Guy,” and “no more talk.”

“Just do it.”

In an interview on Fox Business Network Thursday, Trump called the unmasking of General Michael Flynn “the greatest political crime in the history of our country” and demanded jail time for those involved.

“People should be going to jail for this stuff and hopefully, a lot of people are going to have to pay,” he said.

RELATED: Obama’s UN Ambassador Samantha Power Tried To Unmask Flynn Seven Times, She Testified Having ‘No Recollection’ Of Doing So

Graham Says ‘No’

Graham, while indicating members of Obama’s inner circle such as former acting Attorney General Sally Yates and former FBI Director James Comey would testify, has said he doesn’t foresee Obama under oath.

“I’m not anticipating calling President Obama,” Graham told Politico.

The Politico report indicated other Senate Republicans similarly declined the President’s request to investigate the former President.

Graham shouldn’t really have a problem considering such a move.

Last September, the Republican congressman expressed interest in seeing former Obama questioned under oath about the counterintelligence investigation against the Trump campaign.

That was before proof that the FBI tried to entrap General Michael Flynn. Before a list was published of people in the Obama administration who tried to unmask and publicly name him – a felony – was declassified. And before Obama got caught in the Russia collusion hoax.

It isn’t hard to believe that Democrats, the moment Trump is out of office, will force him to testify on a variety of matters. Time for Graham to grow a spine and call Obama.