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WASHINGTON — President Donald Trump on Wednesday said his attorney general, Jeff Sessions, should end special counsel Robert Mueller’s investigation into Russian election interference, arguing that the ongoing probe is hurting the United States.

Although the president has repeatedly criticized the investigation and Sessions’ decision to recuse himself from overseeing it, Trump’s tweet that his attorney general “should stop” the probe is notable and raises fresh questions about whether the President is attempting to obstruct justice.

The Justice Department declined to comment on Trump’s tweet.

While several members of Mueller’s team have donated to Democrats, Russia’s interference in the 2016 election has also been the subject of several Republican-led congressional inquiries.

Mueller is a Republican who was appointed as FBI director by President George W. Bush, and the man who tapped him as special counsel, Deputy Attorney General Rod Rosenstein, was named by Trump and is also a registered Republican.

Last year, Sessions recused himself from any investigation related to the 2016 presidential campaigns soon after it came to light that he had failed to disclose during his Senate confirmation hearing contacts with Russia’s ambassador to Washington.

After he stepped aside, Rosenstein appointed Mueller as special counsel to look into Russian interference, including whether any Trump campaign officials coordinated with Moscow.

A central focus of Mueller’s is whether Trump has obstructed justice in the Russia investigation, and Wednesday’s tweet could be scrutinized by the special counsel’s team.

Citing three people briefed on the matter, The New York Times reported last month that Mueller is reviewing Trump’s tweets as well as “negative statements” made by the president related to the attorney general and former FBI director James Comey, whom Trump abruptly fired last year.

California Rep. Adam Schiff, the top Democrat on the House Intelligence Committee, raised the question on Wednesday shortly after Trump’s remark.

The president has escalated his attacks on the Mueller probe in recent days, and his tweet on Wednesday comes on the second day of former Trump campaign chairman Paul Manafort’s trial, the first case Mueller’s team has taken before a jury.

Manafort is facing charges of bank fraud and tax evasion, though his alleged crimes occurred before he was involved with the Trump campaign.

Trump brought up Manafort by name in a second tweet on Wednesday, saying that he has worked in the past for “highly prominent and respected political leaders,” and that the charges against him “have nothing to do with Collusion,” which he referred to as “a Hoax!”

In another tweet on Wednesday, Trump wrote, “Russian Collusion with the Trump Campaign, one of the most successful in history, is a TOTAL HOAX.”

Trump has repeatedly denied that his campaign colluded with Russia. He has repeatedly criticized Sessions for recusing himself and has pressured the attorney general on multiple occasions to overturn his recusal.

On Tuesday, Trump repeated an argument recently made by his attorney Rudy Giuliani that collusion is not actually a crime.

Legal experts have pointed out, however, that if any individuals are found to have collaborated with Russia during the 2016 election, they could be charged with crimes such as conspiracy.