Federal investigators say a man accused in apparent attempt to assassinate former President Donald Trump left a note behind admitting to his plans, and members of Congress come to an agreement on a spending deal to avert a government shutdown.

Feds: Man accused in assassination attempt wrote note indicating he intended to kill Trump

The man accused in the apparent assassination attempt of Donald Trump at a golf course in Florida left behind a note detailing his plans to kill the former president and kept in his car a handwritten list of dates and venues where Trump was to appear, the Justice Department said Monday in foreshadowing additional and more serious charges against him.

The new allegations were included in a detention memo filed ahead of a hearing Monday at which federal prosecutors argued that Ryan Wesley Routh should remain locked up as a flight risk and a threat to public safety. U.S. Magistrate Ryon McCabe agreed, saying the "weight of the evidence against the defendant is strong" and ordered him to stay behind bars.

The latest details were meant to bolster the Justice Department's contention that the 58-year-old suspect had engaged in a premeditated plan to kill Trump, a plot officials say was thwarted by a Secret Service agent who spotted a rifle poking out of shrubbery on the West Palm Beach golf course where Trump was playing and then opened fire in Routh's direction.

The note describing Routh's plans was placed in a box that he dropped off months earlier at the home of an unidentified person who did not open it until after last Sunday's arrest, prosecutors said. The box also contained ammunition, a metal pipe, building materials, tools, phones and various letters. The person who received the box and contacted law enforcement was not identified in the Justice Department's detention memo.

One note, addressed "Dear World," appears to have been premised on the idea that the assassination attempt would be unsuccessful.

"This was an assassination attempt on Donald Trump but I failed you. I tried my best and gave it all the gumption I could muster. It is up to you now to finish the job; and I will offer $150,000 to whomever can complete the job," the note said, according to prosecutors.

The letter offers "substantial evidence of his intent," Assistant U.S. Attorney Mark Dispoto said in court Monday.

"That's the message he wanted to send to the world in advance of this incident" he said.

Routh is currently charged with illegally possessing his gun in spite of multiple felony convictions, including two charges of possessing stolen goods in 2002 in North Carolina, and with possessing a firearm with an obliterated serial number.

But Dispoto said prosecutors would pursue additional charges before a grand jury accusing him of having tried to "assassinate a major political candidate."

Spending deal averts a possible federal shutdown and funds the government into December

Congressional leaders announced an agreement Sunday on a short-term spending bill that will fund federal agencies for about three months, averting a possible partial government shutdown when the new budget year begins Oct. 1 and pushing final decisions until after the November election.

Lawmakers have struggled to get to this point as the current budget year winds to a close at month's end. At the urging of the most conservative members of his conference, House Speaker Mike Johnson, R-La., had linked temporary funding with a mandate that would have compelled states to require proof of citizenship when people register to vote.

But Johnson could not get all Republicans on board even as the party's presidential nominee, Donald Trump, insisted on that package. Trump said Republican lawmakers should not support a stop-gap measure without the voting requirement, but the bill went down to defeat anyway, with 14 Republicans opposing it.

Bipartisan negotiations began in earnest shortly after that, with leadership agreeing to extend funding into mid-December. That gives the current Congress the ability to fashion a full-year spending bill after the Nov. 5 election, rather than push that responsibility to the next Congress and president.

In a letter to Republican colleagues, Johnson said the budget measure would be "very narrow, bare-bones" and include "only the extensions that are absolutely necessary."

"While this is not the solution any of us prefer, it is the most prudent path forward under the present circumstances," Johnson wrote. "As history has taught and current polling affirms, shutting the government down less than 40 days from a fateful election would be an act of political malpractice."