Rep. Patrick Meehan, R-Pa., on Thursday demanded that the Philadelphia office of the Department of Veterans Affairs investigate tweets from last year in which a top official may have been calling a VA whistleblower a "piece of s--t."

Lina Giampa, the VA's human resources manager in Philadelphia, wrote two mean tweets in June 2014, on the same day that officials started a probe into the VA's healthcare scandal.

It's not clear who Giampa was tweeting at, but the Philadelphia Inquirer reported Thursday that it may have been aimed at whistleblowers in Philadelphia who were exposing fraud at the agency.

"So all you need to do is make false allegations and suddenly it's gospel," Giampa wrote in one tweet. "You know who you are you piece of s--t. You & your accomplice."

Congress has called on the VA repeatedly to ensure that whistleblowers who are exposing the numerous problems at the broken agency are not harassed or intimidated. In a Thursday letter to Diana Rubens, the Philadelphia Regional Office Director, Rep. Meehan said an investigation is needed into whether the tweets were another example of that kind of harassment.

"I am requesting an immediate investigation into this matter," he wrote. "Those found in violation of personnel or whistleblower protection policies must be held accountable."

"Your swift inquiry into this matter is necessary to assure VARO employees that their managers will not tolerate threats and intimidation against those who speak up on behalf of America's veterans," he added.

RELATED: Obama slammed for ignoring possible VA hospital closures

After more than a year after the VA scandal broke, the agency has been unable to manage itself and ensure veterans have access to healthcare. Veterans are still experiencing large wait times for access to care, and the VA hasn't fired anyone for their role in the scandal.

The VA also continues to mismanage its funding. A hospital in Denver is more than $1 billion over budget, and the VA has refused congressional demands to shut down on the $360 million in bonuses it awards employees each year to make up the difference.

This week, the chairman of the House Veterans' Affairs Committee wrote an angry letter to President Obama asking him to get involved in the latest scandal — a $3 billion shortfall that could lead VA hospitals to close in August.

"VA's central office is physically located steps from the White House front door," Chairman Jeff Miller, R-Fla., wrote to Obama. "I strongly suggest you pay a visit and get to the bottom of what is happening."