King Charles I was executed for allying with foreign and hostile powers during the English Civil War against Oliver Cromwell.
The former intelligence officer said FBI officials greeted his July memo with “shock and horror” but did not request additional information.
The FBI then asked him for more memos in August, he added, prompting him to submit dossiers on members of Trump’s inner circle with ties to Russia.
“It’s quite clear there was or is a pretty substantial inquiry going on,” he said of the FBI’s examination of Trump’s links to Moscow.
“This is something of huge significance, way above party politics,” the former spook added. “I think [Trump’s] own party should be aware of this stuff as well.”