Bolton’s last tweet on the account — his personal profile, rather than a White House-owned account he took over when he became national security adviser — prior to Friday had been his rebuttal of Trump’s claim he’d been fired.

But he’s come under renewed scrutiny as the impeachment inquiry into Trump heated up and as Democrats struggled to secure testimony from Trump’s inner circle about why hundreds of millions of dollars in aid for Ukraine were put on hold this summer.

He did not show up to his scheduled deposition with impeachment investigators earlier month, but he's not been subpoenaed in the probe, as Democrats look to avoid a protracted court battle over the matter.

Investigators have instead said they would take his refusal appear as another instance of obstruction by the White House.

When asked if he felt the administration was trying to stop him from testifying, Bolton said, "I don't know. You have to ask the White House."

"But I can say definitively we have regained control of the Twitter account," he added.

Still, his lawyer teased earlier this month that Bolton was "personally involved in many of the events, meetings and conversations" central to the inquiry in addition to "many relevant meetings and conversations that have not yet been discussed."

In public and private appearances since his departure from the White House, Bolton has not held back about his disagreements with Trump, and is reportedly working on a hotly anticipated book about his time in the West Wing.

He resurfaced on social media Friday morning with a series of cryptic tweets just as Trump began an interview on Fox News.

"Glad to be back on Twitter after more than two months," he wrote. "For the backstory, stay tuned........"

Glad to be back on Twitter after more than two months. For the backstory, stay tuned........ — John Bolton (@AmbJohnBolton) November 22, 2019

He raised eyebrows with a follow up tweet later, writing: "We have now liberated the Twitter account, previously suppressed unfairly in the aftermath of my resignation as National Security Advisor. More to come....."

In a third post, he elaborated more, for the first time explicitly accusing the White House of preventing him from accessing his account.

"Re: speaking up -- since resigning as National Security Advisor, the @WhiteHouse refused to return access to my personal Twitter account," he wrote. "Out of fear of what I may say? To those who speculated I went into hiding, I’m sorry to disappoint!"

Re: speaking up -- since resigning as National Security Advisor, the @WhiteHouse refused to return access to my personal Twitter account. Out of fear of what I may say? To those who speculated I went into hiding, I’m sorry to disappoint! — John Bolton (@AmbJohnBolton) November 22, 2019

A senior administration official denied revoking Bolton's access to his account, saying the White House wouldn't have the technical means to do so. Trump was asked about the first tweet during his interview on Fox, and he too denied the White House had blocked him in any way.

"No, of course not. Of course not," Trump said, explaining that "I actually had a good relationship with John. We disagreed on some things and some methods but I actually had a good relationship."

Bolton doubled down on his claim later, clarifying in another tweet that it was Twitter, not the White House, who turned his profile back over. "Thank you to @Twitter for standing by their community standards and rightfully returning control of my account," he wrote.

On Saturday, he tweeted: "Let's get back to discussing critical national-security issues confronting America. The threats are grave and growing. The presidency and control of the House and the Senate will all be decided in less than one year. It's time to speak up again! #JohnBolton."

Matthew Choi contributed reporting.