Corey Lewandowski, former campaign manager for President Trump, said he wasn't invited to or aware of a meeting that Donald Trump Jr. attended with a Russia lawyer.

In an interview Thursday night with NBC's Chuck Todd on "Meet the Press Daily," Lewandowski said he doesn't know if he would have accepted an invitation to meet with the Russian lawyer, if he were invited.

He denied that he had ever colluded with Russians, and said anybody who has "should be held accountable."

"I have never colluded, cooperated or contacted any Russians that I am aware of, nobody contacted me that I am aware of and asked to help, solicit, or fix a presidential campaign," Lewandowski said. "But let me be as clear as I can be. If anybody, and I mean anybody, did something with a foreign government that materially impacted the outcome of this election that person should be held accountable to the fullest extent of the law, whoever that person is. Because we cannot have individuals who are meddling with foreign governments to potentially impact the outcome of the election."

Trump fired Lewandowski as campaign manager June 20, 2016, and was replaced by Paul Manafort, who had been serving as campaign chairman and chief strategist.

Before Manafort replaced Lewandowski, he joined Trump Jr., the president's oldest son, in the June 9, 2016 meeting with Natalia Veselnitskaya, a Russian lawyer who promised damaging information on Hillary Clinton. Jared Kushner, Trump's son-in-law and senior adviser, also attended the meeting.

Committees in Congress and special counsel Robert Mueller will review the meeting as part of investigations into Russia's election interference, and whether the Trump campaign worked with Moscow.