Watergate prosecutor Nick Ackerman said ousted FBI Director James Comey’s testimony Thursday marks the first part of an obstruction of justice case into President Trump.

“Comey came out and put in the first leg of the obstruction case, which is that meeting in the Oval Office,” Akerman told MSNBC’s Lawrence O’Donnell on Friday.

ADVERTISEMENT

“That is one of four legs of the obstruction case that we have that include the two national security people who say that Trump called them and asked them to help stop that investigation, as well as the firing of Mr. Comey,” he continued.

Akerman was referring a meeting seen in Comey’s opening testimony where the president asked Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE and White House adviser Jared Kushner to leave the Oval Office before asking the then-FBI director to let the probe into former national security adviser Michael Flynn go.

The president denied that claim Friday and said he would “100 percent” testify under oath to Robert Mueller, who is the special counsel heading the probe into Russia’s election meddling.