Dallas Alexander, a veteran sniper whose team holds the world record for the longest confirmed sniper kill, has suggested that Thomas Matthew Crooks, the 20-year-old who attempted to assassinate former President Donald Trump at a rally on Saturday night, may have had inside help.

Alexander, who spent 14 years in a sniper team for the Canadian military providing close protection for major world leaders including the Canadian Prime Minister, shared his views in an Instagram post.

"I'm a retired sniper so because I've been asked so many times here's my opinion on the attempted assassination of former President Donald Trump," he began, before delving into his analysis of the assassination attempt.

Having served in a tier one special operations unit called JTF2, Alexander is no stranger to high-stakes security scenarios. His experience includes providing security for VIPs in dangerous countries like Iraq and Afghanistan.

"I spent just about 17 years in the military, 14 of which, just about 14 of which we're at a tier one special operations unit called JTF2. Our sniper team has the world record for the longest confirmed sniper kill. A huge part of our job while I was there and while I was a sniper was doing close protection for VIPs up to and including the Prime Minister, when he would go to dangerous countries like Iraq or Afghanistan, we would be in charge of that security," said Alexander.

This background gives him unique insights into the layout and security measures typically involved in protecting high-profile individuals such as former President Trump.

Alexander expressed his belief that the shooter must have had assistance from within an agency, organization, or even the government. He argued that it would be impossible for someone to get onto a rooftop with a gun during broad daylight while a president was speaking without assistance.