"Red Line", "constitutional crisis": President Donald Trump was accused Thursday of having flouted two fundamental principles of American democracy, the independence of the judiciary and freedom of the press.

The day before, he sacked his Minister of Justice, Jeff Sessions, fearing a resumption of control of the very sensitive Russian investigation. In the evening, the White House withdrew its accreditation to a CNN reporter.

Controversial decisions that pushed hundreds of people into the streets on Thursday night in front of the White House in Washington and New York.

Brandishing placards "You can not dismiss the truth" or "Trump is a danger to us all", the protesters have in particular asked Congress to intervene to "protect the investigation (Russian)".

The United States is "on the edge of the constitutional crisis," denounced earlier in the day the Democratic opposition, which regained control of the House of Representatives in the midterm elections on Tuesday, and seems ready for the counteroffensive.

With this new majority, Democrats have indeed raised the threat of a parliamentary inquiry as soon as they take office in January. In this perspective, their leaders wrote to the FBI, the CIA, the Treasury, among others, asking them to keep all documents related to this dismissal and the delicate Russian investigation.

There is no "constitutional crisis" or "political crisis," retorted President Kellyanne Conway's advisor. The White House has, according to her, "never hindered" the investigation into Russian interference in the 2016 presidential campaign, including one on suspicions of collusion between Moscow and the team of candidate Trump.

Justice Minister Jeff Sessions had recused himself in 2017 in this investigation - because of contacts made with the Russian ambassador - which had caused him to fall in disgrace with the president.

On Wednesday, he presented his resignation "at the request" of Donald Trump , who had accused him for months of being a "very weak" minister, unable to protect him.

The president, whose former collaborators have been indicted in the Russian investigation, denounces a "witch hunt" and has regularly called for an end to the investigations of the special prosecutor Robert Mueller.

 "Slow Massacre

The acting at the Department of Justice is provided by Jeff Sessions' former chief of staff, Matthew Whitaker, who, before joining his service, had criticized the extent of the Russian investigation and its cost.

Beyond the Democrats, some Republicans feared his arrival would mean the end of independence for prosecutor Mueller. Republican Senator Susan Collins said it was "imperative that the government not interfere with its investigation".

The moderate Republican Jeff Flake has planned to ask the Senate, when resuming its work next week, to pass a law guaranteeing the independence of the special prosecutor, already adopted in committee.

"Donald Trump has set up an affidian to oversee the Russian investigation and crossed a red line," the progressive association Move On also denounced.

Some commentators have drawn parallels between this ouster and the order given in 1973 by President Richard Nixon to his Minister of Justice to dismiss the special prosecutor in charge of the Watergate investigation.

The minister and his number two preferred to quit instead of complying, but Nixon was successful at the "Saturday night massacre".

Jake Tapper, CNN's star reporter, said the forced departure of Jeff Sessions was a slow, multi-month repeat of the massacre.

 "Unacceptable

The channel is very critical of Donald Trump , who in turn often calls it "fake news media".

Wednesday night, the White House suspended the accreditation of one of its journalists after an altercation with Donald Trump in a press conference.

CNN reporter Jim Accosta, engaged in a heated exchange with the president, refused to return the microphone to a White House employee, touching her lightly during the exchange.

"We will never tolerate a reporter put his hand on a young woman," commented in the wake Sarah Sanders, to justify his exclusion.

CNN supported her journalist and was alarmed by an "unprecedented decision" that she says is "a threat to our democracy".

An association representing the presidential press has called on the White House to cancel a "disproportionate" and "unacceptable" sanction.