House Intelligence Committee Chair Devin Nunes reiterated that “no evidence of collusion” between Donald Trump’s team and Russia has been found ahead of the first public hearing on the matter.

The Republican told Fox News Sunday that the leaking of former Trump aide General Michael Flynn’s name to the media is “the one crime we know that's been committed.”

READ MORE: Gen. Michael Flynn resigns as National Security Advisor over contacts with Russia

He added that the Congressional panel, which is investigating accusations of Russia's interference in the 2016 US election, was also investigating whether the names of other Trump aides were leaked to the press.

.@DevinNunes tells Chris: leaking of @GenFlynn's name to media is “the one crime we know that's been committed” #FNS — FoxNewsSunday (@FoxNewsSunday) March 19, 2017

"No evidence of collusion" House Intel Chair Nunes says when pressed if he's seen anything to back up Trump world colluding w/Russia on elex — Deirdre Walsh (@deirdrewalshcnn) March 19, 2017

Nunes, who has previously stated that no evidence of Trump-Russia collusion has been identified by the committee, confirmed this was still the case going into the first public hearing on Monday of the investigation into “Russian active measures.”

FBI Director James Comey and NSA Director Mike Rogers are both scheduled to testify at the hearing.

The committee chair also addressed Trump’s recent allegation that his predecessor, Barack Obama, wiretapped Trump Tower just before the Republican’s election victory in November, with Nunes stating that no evidence of this has been found, either.

On Trump’s wiretapping claims. @DevinNunes: The President doesn’t wiretap people, so if you take the President literally, it didn’t happen. — FoxNewsSunday (@FoxNewsSunday) March 19, 2017

Nunes noted that, as far as he is aware, there was no FISA warrant issued for this purpose.

READ MORE: No evidence Trump Tower wiretapped - House Intel Committee

Obama has denied the allegation, though the White House called on Congress to investigate the alleged abuse of executive power.