President Donald Trump can't quit his ongoing beef with Attorney General Jeff Sessions, as reflected by this insulting tweet on Monday morning.

Not surprisingly, there have been plenty of Twitter reactions to this.

The falling out between Trump and Sessions ends a friendship that even predated Trump's presidential ambitions. The two became close after Sessions called Trump to testify as an expert witness about the cost to taxpayers of proposed United Nations renovations, and few were surprised when Sessions became one of the few sitting senators to endorse Trump's 2016 presidential campaign.

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Then Trump picked Sessions as his attorney general, and everything changed.

The origins of the Trump-Sessions rift can be traced back to the attorney general's decision to recuse himself from the ongoing investigation into Russia. The president perceives this decision as indicating personal weakness on Sessions' part and blames it, at least in part, for the fact that he has not been able to shake off the scandal.

Trump's bad will toward Sessions is so severe that the president even told The New York Times: "Sessions should have never recused himself, and if he was going to recuse himself, he should have told me before he took the job and I would have picked somebody else" to be attorney general.

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It is noteworthy that, despite his personal beef with Sessions, the president continues to support the policies being implemented by the attorney general. These include the attorney general's escalation of the war on drugs and lack of sympathy for individuals who complain of civil rights violations from police officers.