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

Donald Trump Jr.Donald (Don) John TrumpTrump Organization drops plans to open new hotels amid scrutiny: report Drama hits Senate Intel panel’s Russia inquiry Schultz won't say if he will sell all Starbucks shares if he becomes president MORE said he's not worried about potentially being incriminated in special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 ClintonO’Rourke heading to Wisconsin amid 2020 speculation The Hill's 12:30 Report — Presented by Kidney Care Partners — Lawmakers scramble as shutdown deadline nears Exclusive: Biden almost certain to enter 2020 race MORE.

While Trump Jr. initially maintained the meeting was focused on Russian adoption policy and called it a "waste of time," President TrumpDonald John TrumpBill Kristol resurfaces video of Pence calling Obama executive action on immigration a 'profound mistake' ACLU says planned national emergency declaration is 'clear abuse of presidential power' O'Rourke says he'd 'absolutely' take down border wall near El Paso if he could 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 ManafortThe Hill's 12:30 Report — Presented by Kidney Care Partners — Lawmakers scramble as shutdown deadline nears CNN's Toobin: 'Almost unrecognizable' Manafort 'in danger of losing his life' in prison The Hill's Morning Report - Presented by the American Academy of HIV Medicine - Will there be any last-minute shutdown drama? MORE, who also attended the Trump Tower meeting, was convicted last month on charges of of bank fraud and tax fraud.