WASHINGTON — President Trump is convinced that someone in the Biden family left behind the bag of cocaine that was found in the West Wing in July 2023 — and has vowed to conduct an investigation.

In an interview with The Spectator World Thursday, Trump spilled that his return to the Oval Office persuaded him that “either Joe or Hunter” Biden misplaced the white powder in the White House.

“That was such a terrible thing because, you know, those bins are very loaded up with … they’re not clean, and they have hundreds and even thousands of fingerprints,” the president said, referring to the lockers where the cocaine was found. 

“And when they went to look at it, it was absolutely stone cold, wiped dry. You know that, right?”

Trump, 78, added that he was “going to look into that because … bad stuff happened there.”

House Oversight Committee Chairman James Comer (R-Ky.) revealed last month that he folded up a congressional probe into the matter due to interference by the US Secret Service.

“I had to abandon the probe I led into the cocaine found at the Biden White House because the Secret Service destroyed the little plastic bag that contained the cocaine a few days after it was discovered,” Comer wrote in his new book, “All the President’s Money: Investigating the Secret Foreign Schemes that Made the Biden Family Rich.”

“And the tapes in the White House — amazingly — did not show the particular location of the discovery,” he also said.

Secret Service reps claimed that the investigation into who left behind the dime-sized bag of nose candy in a cubby one floor below the Oval Office was closed after 11 days due to “lack of physical evidence.”

FBI forensic testing had failed to turn up fingerprints or sufficient DNA, according to the agency, after around 500 visitors were considered suspects.

Agency reps never disclosed whether any were interviewed. The cocaine was later destroyed.

Secret Service sources, however, told the outlet RealClearPolitics that DNA had been recovered and yielded a “partial hit” in a national database after the drug was found on July 2, 2023.

The discovery of the “white, powdery substance” prompted a brief evacuation and response by a DC Fire Department hazmat team, which first identified it.

At the time, then-President Biden and the first lady were on retreat at Camp David with Hunter, who had reportedly been living at the White House the month prior.

The troubled first son had also battled a crack cocaine addiction for years before sobering up in 2019, as his dad geared up for a White House run.

A Post reporter pressed White House press secretary Karine Jean-Pierre about the coke bag during a briefing five days after it was found.

“Can you say once and for all whether or not the cocaine belonged to the Biden family?” The Post asked.

“You know, there has been some irresponsible reporting about the family,” Jean-Pierre replied. “And, uh, and so I’ve got to call that out here.”