President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's former national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE tweeted Tuesday that the country's national security priorities are "under attack from within."

"It probably goes without saying, that our country’s commitment to our national security priorities is under attack from within," Bolton tweeted.

"America is distracted. Our enemies are not. We need to make U.S. national security a priority."

It probably goes without saying, that our country’s commitment to our national security priorities is under attack from within. America is distracted. Our enemies are not. We need to make U.S. national security a priority. #JohnBolton — John Bolton (@AmbJohnBolton) November 26, 2019

He did not elaborate further.

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On Friday, Bolton tweeted for the first time in over two months and claimed that the White House "refused to return access to [his] personal Twitter account."

Trump denied that this happened, saying that he had a "good relationship" with Bolton.

The next day, in another tweet, Bolton urged the U.S. to "get back to discussing critical national-security issues confronting America," calling the dangers "grave" and "growing."

Many believe Bolton to be a key witness regarding the House Democrats' ongoing impeachment proceedings against Trump, but Bolton has said he would only testified if subpoenaed, and Democrats have yet to do so.

Since his return to Twitter, Bolton has yet to say anything regarding whether he will change his mind and testify without a subpoena.