Donald Trump and his friend and campaign advisor Roger Stone (File)

Donald Trump is accused of witness tampering, after Twitter messages directed at former advisors who are — and are not — cooperating with the Trump-Russia investigation.

Rattled by revelations from his former lawyer and fixer Michael Cohen, linking Trump’s business interests in Russia with his 2016 campaign, Trump blasted on Monday:

Cohen once said he would “take a bullet” for Trump. However, when he pleaded guilty in August to eight counts over financial crimes and campaign finance violations — including payoffs to two women over claimed sexual encounters with Trump — he has been testifying to Special Counsel Robert Mueller’s investigators.

Last Thursday, Cohen pleaded guilty to a charge of lying to Congress. He said that the pursuit of a Trump Tower in Moscow continued until June 2016, when Trump was on the verge of the Republican nomination and amid Russian hacking to obtain e-mails which could damage Democrat nominee Hillary Clinton.

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After his verbal assault on his former lawyer, Trump turned to Roger Stone, a campaign advisor suspected of liaising with WikiLeaks’ founder Julian Assange to release the anti-Clinton material.

On Sunday, Stone told ABC News: “There’s no circumstance under which I would testify against the president because I’d have to bear false witness against him. I’d have to make things up, and I’m not going to do that.”

Trump praised the self-proclaimed “dirty trickster”, who remains in contact with the Trump camp:

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Buoyed by the support, Stone’s friend Michael Caputo immediately launched a GoFundMe campaign for the advisor’s legal defense, while Stone used his Instagram account to hail Trump’s intervention.

Multiple legal analysts — including George Conway, the husband of White House advisor KellyAnne Conway — noted the statutes which Trump may have violated.

Trump pressed ahead with a swing at Mueller’s team:

He then remembered that Washington will be occupied today with memorial services for President George H.W. Bush, who died last week: “Looking forward to being with the Bush Family to pay my respects”.