QUANTICO, Va. — Taking aim at the credibility of the FBI, President Donald Trump unleashed a blistering attack on the bureau’s leadership even as he praised state and local police officers as a bulwark against rising violence and crime.

Trump denounced the bureau for its handling of the Hillary Clinton email investigation, calling it “really disgraceful” and continuing his practice of questioning his country’s intelligence and law enforcement institutions like no president before.

“It’s a shame what’s happened with the FBI,” the president said. “We’re going to rebuild the FBI; it’ll be bigger and better than ever, but it is very sad when you look at those documents, and how they’ve done that is really, really disgraceful and you have a lot of very angry people that are seeing it.”

The president’s broadside appeared to originate in anger over revelations that senior FBI officials exchanged anti-Trump and pro-Hillary Clinton text messages while working on last year’s Clinton probe and during special counsel Robert Mueller investigation into whether Trump associates colluded with Russian officials in the 2016 election.

In a head-spinning sequence, Trump laced into the bureau as he was set to depart for its training academy in Virginia, where he lavished praise on graduates of a weeks-long FBI National Academy program for law enforcement leaders from around the country.

He praised the graduates, who were trained on FBI standards, touting their accomplishments and pledging his unwavering support. Trump told law enforcement leaders he is “more loyal than anyone else could be” to police.

“Anti-police sentiment is wrong and it’s dangerous,” he added. “Anyone who kills a police officer should get the death penalty.”

With the attack, the White House joined a growing movement among conservative media and some Republicans to question the integrity of Mueller’s investigation.