Trump Jr. says he’s not worried about going to jail due to Mueller probe
© Greg Nash

Donald Trump Jr.Donald (Don) John TrumpDick Cheney to attend fundraiser supporting Trump reelection: report House chairman warns foreign governments to 'cease and desist' spending money at Trump properties Chris Cuomo: 'I should be better than the guys baiting me' MORE said he's not worried about potentially being incriminated in special counsel Robert MuellerRobert (Bob) Swan MuellerTrump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony Kellyanne Conway: 'I'd like to know' if Mueller read his own report MORE's investigation, but acknowledged the ongoing probe has been "very rough" for him personally.

“I’m not [worried] because I know what I did and I’m not worried about it,” Trump Jr. said in an interview with ABC News.

“That doesn’t mean they won’t try to do something,” he added.

The president's eldest son has been a key figure in Mueller's investigation into Russian interference in the 2016 election because of his role in a July 2016 meeting at Trump Tower.

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Trump Jr. agreed to meet with a Russian lawyer who had promised dirt on then-Democratic presidential candidate Hillary ClintonHillary Diane Rodham ClintonTop Sanders adviser: Warren isn't competing for 'same pool of voters' Anti-Trump vets join Steyer group in pressing Democrats to impeach Trump Republicans plot comeback in New Jersey MORE.

While Trump Jr. initially maintained the meeting was focused on Russian adoption policy and called it a "waste of time," President TrumpDonald John TrumpTrump pushes back on recent polling data, says internal numbers are 'strongest we've had so far' Illinois state lawmaker apologizes for photos depicting mock assassination of Trump Scaramucci assembling team of former Cabinet members to speak out against Trump MORE confirmed the meeting was intended to gather information on Clinton last month as he sought to defend his son.

Both Trump and Trump Jr. have insisted the president was not aware of the meeting before it took place.

Trump Jr. told ABC that he believes there "will never be a conclusive end" to the Mueller investigation, which the president frequently labels a "witch hunt."

“It’s obviously been very rough,” Trump Jr. said of the investigation's toll on him personally.

“At the same time, I think I'm able to compartmentalize it,” he added. “And in the end I know what I've done, and I'm not worried about that at all, because you know, I’ve done nothing that anyone else wouldn't do in that position, in my opinion.” 

Four former Trump associates have been indicted or pleaded guilty as part of Mueller's investigation thus far. Former Trump campaign chairman Paul ManafortPaul John ManafortTrial of ex-Obama White House counsel suddenly postponed Top Mueller probe prosecutor to join Georgetown Law as lecturer DOJ releases notes from official Bruce Ohr's Russia probe interviews MORE, who also attended the Trump Tower meeting, was convicted last month on charges of of bank fraud and tax fraud.