Proud Democrat Ryan Routh wrote a manifesto months before trying to assassinate Trump. Additionally, his manifesto offered $150k to anyone who would assassinate Trump.
He is now being charged for his failed assassination attempt.
https://www.bbc.com/news/articles/c89ly20vvgvo
Suspect described Trump 'assassination attempt' in pre-written note

A suspected gunman arrested near Donald Trump's golf-course wrote a note months earlier saying he intended to kill the former president, a court filing shows.

"This was an assassination attempt on Donald Trump," the note says.

Prosecutors included the note in a court filing on Monday, and said they would try to charge 58-year-old Ryan Routh with the attempted assassination of a major political candidate.

US Federal Judge Ryon McCabe ordered that Routh remain behind bars without bail pending his trial, saying that the "weight of the evidence against the defendant is strong".

Routh is so far facing two federal gun crime charges, including for possessing a firearm as a convicted felon.

Federal prosecutors, however, said in court that they would ask a grand jury in the coming days to also charge Routh with the more serious crime of plotting to assassinate a political candidate, saying that evidence suggests he had been plotting an attack on Trump.

In the pre-written letter, addressed to "The World" and sent to an unnamed witness months before the 15 September incident, Routh appears to pre-empt a failed assassination attempt on the former president.

"I tried my best and gave it all the gumption I could muster," the letter reads.

Routh, who told a judge during his first court appearance last week that he had no funds and no savings, then says in the letter that he would pay a cash reward to anyone "who can complete the job".

A box containing the letter - as well as ammunition, building materials, tools and four phones - were dropped off at the home of the witness before the incident, according to the court documents filed.