The Army rebuked President Donald Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE’s new national security adviser, Lt. Gen. H.R. McMaster, in 2015 for mishandling a sexual assault case, according to a Washington Post report.

McMaster allegedly allowed two junior officers to attend an elite Ranger School while under investigation for sexual assault, which violates Army regulations, according to a report by the Army inspector general.

The case against the two lieutenants was dropped months later after the Army decided the alleged victim was “not a credible witness,” the Washington Post reports.

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McMaster received a minor reprimand for mishandling the case in the form of a “memorandum of concern,” according to a Freedom of Information Act obtained by the Washington Post.

“I am disappointed with your actions,” Gen. Daniel Allyn, the Army's vice chief of staff, wrote in the memorandum in February of last year.

“As a senior leader in the United States Army, you are expected and required to understand and comply with all laws and regulations."

McMaster’s personnel file does not include this memorandum.

McMaster declined the Washington Post’s request for an interview.

“Lt. Gen. McMaster has served alongside women, and benefited from their bravery and dedication, his entire career. As a commander he has been a leader in sexual assault prevention in each of his commands. To suggest otherwise is to unfairly impugn the character and integrity of a true American hero,” White House spokeswoman Sarah Huckabee Sanders said in a statement to the Washington Post.

The two second lieutenants who played rugby at the U.S. Military Academy at West Point in 2013, allegedly groped a female cadet multiple times.

The female cadet was interviewed by investigators who were looking into sexually degrading emails that some of the rugby players had circulated.

Following her claims of groping, the matter was passed on to an Army prosecutor and criminal investigators who deemed there was probable cause to open a case, according to the documents acquired by the Washington Post.

During that time, the two men had already been accepted to the prestigious Ranger School in Fort Benning, Ga., where McMaster was then serving as a commanding general.

Army regulations, however, prevent subjects under criminal investigation from enrolling in the program.

When unidentified congressional officials learned about this breach of Army regulations, they called for an investigation, the Washington Post reports.

The inspector general, whom the Army tapped to look into the breach, decided in 2014 McMaster's actions violated Army regulations.

McMaster admitted knowing about the sexual assault investigation, justifying his decision by saying he did not want to prematurely punish them or impede their military training.

To attend the Ranger school and comply with Army regulations, McMaster would’ve needed to obtain a special Pentagon-issued waiver.

McMaster told investigators that he did not know about the Army’s waiver requirement.

The inspector general concluded the investigation, reasoning that McMaster unknowingly violated the Army regulation.

Later, McMaster gave the two lieutenants formal reprimands, which they appealed after completing the Ranger School in 2014.

McMaster reversed his decision to reprimand them after the female cadet gave contradictory statements under oath in a separate criminal case, military documents obtained by the Washington Post reportedly show.

An Army spokeswoman at the Pentagon declined the Washington Post’s request for comment.

Trump chose McMaster to be his national security adviser in late February following the controversy surrounding former National Security Adviser Michael Flynn and after retired Navy Adm. Robert Harward declined the White House position.

The Senate does not confirm the president's national security adviser pick. McMaster, however, will need Senate confirmation to retain his position as a three-star general while also serving in the White House.