Ken Starr, who led an unsuccessful impeachment prosecution of President Bill Clinton, said he doesn't yet see an obstruction of justice case against President Trump.

At issue in Starr's opinion is the soft language Trump allegedly used to try to get fired FBI Director James Comey to back off an investigation of Trump's former national security advisor, Mike Flynn.

'You've got to take really affirmative action and Director [James] Comey said in his testimony that even though the expression was hope, he took it as a directive,' Starr said.

Former Bill Clinton prosecutor Kenn Starr said it was 'too soon' to say whether President Trump engaged in obstruction of justice

Starr said it was 'too soon to tell' whether Trump engaged in obstruction.

'From what I've seen — and of course we don't know a whole lot — the answer is no,' he told CNN's 'New Day.'

QUEASY FEELING: 'Comey testified before the Senate Intelligence Committee that it made him 'queasy' when at one point Lynch directed him to discuss the federal investigation into Clinton's private email server as a 'matter' rather than a full-blown 'investigation'

Former special prosecutor spoke about the obstruction issue on CNN Thursday

'But it is going to be investigated and so we will soon know,' he continued, The Hill reported.

Comey testified that Trump didn't order him to halt the Flynn probe, but expressed his hope that it would go away.

'But what we know is, he didn't do anything about it, right? That is that he did not dismiss the investigation or curtail the investigation. There's an expression of hope, so it becomes an interpretation,' Starr told CNN.

Deputy attorney general Rod Rosenstein says he would only fire special counsel Robert Mueller with 'good cause,' and vouched for his 'full independence'

Former FBI Director James Comey

One of the most damaging pieces of information against Trump could be his own comments. He told NBC's Lester Holt Russia was on his mind when he decided to fire Comey, who was leading the Russia investigation.

He also told top Russian officials after the firing 'nut job' Comey, the pressure was off him.

'I faced great pressure because of Russia. That's taken off,' Trump said, according to a New York Times of a summary document of the meeting.

Starr infuriated Democrats during the Bill Clinton impeachment investigation, after an inquiry that started out probing the Whitewater land deal ended up pursuing whether Clinton lied under oath about his affair with former White House intern Monica Lewinsky.

Special counsel Robert Mueller is leading a probe of Russian interference in the presidential election, whether Trump associates had contacts with Russians, as well as whether Trump's firing of Comey was an effort to obstruct the Russia probe, according to media reports.

Special Prosecutor Ken Starr Is Sworn In And Testifies To The House Judiciary Committee Concerning The Possible Impeachment Of President Clinton, Washington, Dc, November 19, 1999

Earlier this week, when attorney general Jeff Sessions testified before an Intelligence panel, Starr told Fox News regarding Sessions: 'I know him to be a man of honor, a man of the law and I thought that came through.'

Starr said of Comey: 'I have serious problems with the way Director Comey conducted himself' following Comey's one-on-one conversations with President Trump.

Former Bill Clinton prosecutor Kenn Starr said it was 'too soon' to say whether President Trump engaged in obstruction of justice

The Senate Judiciary Committee is opening up a probe into President Trump's firing of FBI Director James Comey – and whether any 'improper interference' with the FBI occurred.

Senate Judiciary Chairman Charles Grassley of Iowa revealed the probe in a letter to his Democratic counterpart, Sen. Dianne Feinstein of California.

But the probe won't be exclusively focused on Trump-land. Grassley also wants the investigation to look at Obama attorney general Loretta Lynch and whether she influenced the Clinton email scandal investigation.