During an appearance on Sean Hannity’s Fox News show on Wednesday night, Senate Judiciary Committee Chairman Lindsey Graham (R-SC) claimed he has every intention of calling in former President Barack Obama and grilling him on what he knows about the FBI’s investigation of Donald Trump.

Speaking with the Fox News host, the Republican senator claimed he is pushing forward with his investigation into who told President Obama about the counterintelligence investigation into then-candidate Donald Trump.

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“I can’t imagine an investigation of the Republican nominee for president — a counterintelligence investigation of his campaign — was not approved at the highest level,” Graham claimed. “I cannot imagine it happening without somebody in the White House knowing about it.”

Asked by the host if he would be interested in calling in Obama to testify under oath, Graham said ” Absolutely.,” MSN reports.