A constitutional attorney and a legal scholar say special counsel Robert Muller's investigation into alleged "Russia collusion" has been a fraud and needs to be shut down.

On the eve of Thursday's one-year anniversary of the opening of the Mueller probe, President Donald Trump's attorney Rudy Giuliani urged the special counsel's team to wrap up its investigation. Giuliani told the Fox News Channel that Mueller "has all the facts to make a decision" after 12 months investigating Russian meddling in the election and possible collusion with Trump's campaign.

"It's about time to say enough," said Giuliani. "We've tortured this president enough." He described the investigation as being "like a big weight" on the president's back.

Matt Barber is co-founder and chief counsel of Christian Civil Rights Watch. He agrees with Giuliani's assessment.

"The investigation itself is a fraud – it has [always] been a fraud," he tells OneNewsNow. "It has always been politically motivated, based on nothing but a Democratic narrative – based on this specter of Russian collusion between the Trump campaign and Russia, something that never happened."

And Barber points out that Mueller himself has acknowledged the president isn't even a target for prosecution any longer. "Attorney General [Jeff] Sessions needs to do his job. He needs to step in and shut down this Mueller witch hunt," he says, adding that the AG must also have the political will to do so.

In an op-ed published by the Fox News Channel, Hans von Spakovsky – a senior legal fellow at The Heritage Foundation – questions the need to continue the investigation.

"He spent $10 million and after a year, according to the public record, he hasn't turned over a single piece of evidence of any kind showing that there was any collusion between the Trump campaign and the Russian government – and that was the original purpose of his investigation," notes von Spakovsky in an interview with OneNewsNow.

The Heritage legal fellow says if Mueller refuses to end the probe, the House of Representatives can intervene. "If the House ... believes this money is being improperly used for an improper investigation, then the House could deny appropriation funds for this investigation and withdraw the funding. If that happened, then investigation will definitely end."

Von Spakovsky says Mueller needs to wrap up his investigation, report to Congress, and then let lawmakers either act against the president or allow him to finish his term.

So far, Mueller's office has charged 19 people – including four Trump campaign advisers – and three Russian companies. Trump's former national security adviser, Michael Flynn, and his deputy campaign chairman, Rick Gates, have pleaded guilty and are now cooperating with the probe.

Trump, however, has panned the investigation as a "witch hunt" intended to discredit his presidency and insisted that Russia had nothing to do with his winning 2016 campaign.