WASHINGTON — President Trump on Friday repeatedly called on the Justice Department and FBI to investigate his Democratic political opponents, a breach of the traditional executive branch boundaries designed to prevent the criminal justice system from becoming politicized.

Trump urged federal law enforcement to “do what is right and proper” by launching criminal probes of former presidential rival Hillary Clinton and her party – a surprising use of his bully pulpit, considering he acknowledged a day earlier that presidents are not supposed to intervene in such decisions.

In a flurry of accusatory morning tweets, Trump claimed there was mounting public pressure for new Clinton probes, including over her campaign’s joint fundraising agreement with the Democratic National Committee that effectively gave her some control over the party’s finances, strategy and staffing before the primaries began.

Trump invoked Sen. Elizabeth Warren, D-Mass., who had said that she believed the Democratic primaries were rigged in Clinton’s favor based on details of the arrangement in a new book by former DNC interim chair Donna Brazile.

Using his pejorative nickname for Warren, Trump tweeted: “Pocahontas just stated that the Democrats, lead by the legendary Crooked Hillary Clinton, rigged the Primaries! Lets go FBI & Justice Dept.”

“People are angry,” Trump wrote in one tweet.

“At some point the Justice Department, and the FBI, must do what is right and proper. The American public deserves it!”