Louisa Terrell - one of President Joe Biden's closest and longest-serving aides - is departing the White House. 

Biden confirmed Terrell's departure in a statement that he released on Friday.

The statement begins:

As a U.S. Senator for 36 years, I developed a deep respect and reverence for the United States Congress and its vital institutional role in our democracy. When I was elected President, I knew that no one understood that better – or would be a better partner to my decades-long friends and former colleagues – than Louisa Terrell.

Terrell has a long history with Biden. In fact, she went to kindergarten with Biden's deceased son, Beau, and it was at that time in life that Terrell first met Joe Biden.

Then, many years later, Terrell worked for Biden when he was the U.S. Senator for Delaware and sat on the Senate Judiciary Committee.

Biden, in his statement, continues:

That’s because, for years – as a Senator, as Vice President, as President, and every moment in between – I have relied on Louisa for her wise counsel and her skill. I have relied upon her to reflect my values. And, I have relied upon her to deliver for the American people. Every step of the way, that’s exactly what she has done.

Most recently, Terrell has been the White House director of legislative affairs. CNN describes this role as "the president's point person on Capitol Hill."

In this capacity, Terrell is said to have been "instrumental" in getting Congress to pass several big-ticket items.

Biden's statement highlights some of these accomplishments. It reads:

Over the past two and a half years, Louisa has been instrumental in the historic, monumental, and life-changing legislation we have delivered to the American people. From the American Rescue Plan and the Inflation Reduction Act to the CHIPS and Science bill, the Bipartisan Infrastructure Bill, the Bipartisan Safer Communities Act, and the bipartisan budget agreement – Louisa’s steady hand and perseverance have consistently helped get key priorities over the finish line.

Terrell also helped to get Biden's Supreme Court nominee - Justice Ketanji Brown Jackson - confirmed to the nation's highest court. This is in addition to helping to get Biden's other judicial nominees confirmed.

Biden concludes his statement, "Jill and I extend our deepest gratitude to Louisa for her years of service to the American people, and also to her family, for sharing her with us."

The one thing that has not been provided is why it is that Terrell is suddenly leaving the administration.

Terrell, at the time of this writing, has not released a statement on her departure.

She is scheduled to officially leave the Biden White House by the end of the month.