The sister of the deranged man accused of storming the White House Correspondents’ Dinner armed with guns and knives said he had a tendency to make “radical” statements about politics and had a fixation about needing to do “something” about the issues in today’s world as he saw it through his twisted lens.

Avriana Allen, 27, told Secret Service and Montgomery County Police about his obsession with world events and “constantly” made reference to a “plan” to fix the country, sources told The Post.

She said he purchased two handguns and a shotgun from Cap Tactical Firearms and stored them at their parents’ home without their knowledge, and that he made regular trips to the shooting range to train.

Allen, 31, a CalTech graduate who was named teacher of the month at C2 Education, a tutoring service where he worked part-time, allegedly put his impotent rage into action Saturday night when he attempted to barge into the gala with the intention of killing as many Trump administration officials as he could.

He exchanged gunfire with Secret Service agents before being tackled and arrested at the hotel before he could inflict the carnage he allegedly intended.

One agent was struck by gunfire in their bulletproof vest but is expected to recovery fully.

Allen laid out his demented plot in a sprawling, anti-Trump manifesto he sent to family members 10 minutes before unleashing the attack on the event and its nearly 3,000 attendees.

In it, he referred to himself as the “Friendly Federal Assassin,” and characterized his actions as a righteous struggle against the “crimes” of the Trump administration, calling the president a “traitor” in the unhinged missive.

“I apologize to everyone who was abused and/or murdered before this, to all those who suffered before I was able to attempt this, to all who may still suffer after, regardless of my success or failure,” the manifesto read in part.

“I don’t expect forgiveness, but if I could have seen any other way to get this close, I would have taken it. Again, my sincere apologies.”

He also had an account on BlueSky — the lefty alternative to X — where he repeatedly posted liberal rants and Democratic talking points.

The White House said Sunday that Allen’s brother contacted the New London Police Department in Connecticut prior to the shooting, revealing that he had sent the document around to family members.