Updated at 8:30 a.m. ET

Senior White House adviser Kellyanne Conway has announced that she will step down from her post at the end of the month.

Conway, whose official title is counselor to the president, is known for her tenacious defense of administration policy in frequent appearances on cable television. She is one of President Trump's longest-serving aides.

In a statement on Sunday, she cited a need to "devote more time to family matters."

"I will be transitioning from the White House at the end of this month," she said.

Conway's husband, conservative lawyer George T. Conway III, has become a relentless critic of the president, frequently placing his wife in an awkward position. He announced on Twitter on Sunday that he is withdrawing from the Lincoln Project, a group of Republicans devoted to defeating Trump in November that he helped found. He said he is also taking "a Twitter hiatus."

The news of Conway's impending departure from the White House follows a tweet from her 15-year-old daughter, Claudia, over the weekend announcing that she was "officially pushing for emancipation."

In a series of tweets that followed, she said that her mother's job had "ruined my life" and that she and her father "agree on absolutely nothing," politically.

"We just both happen to have common sense when it comes to our current president."

On Sunday, the teenager clarified in a tweet that her desire for emancipation was not about her mother's job but "about years of childhood trauma and abuse." She then added: "this is becoming way too much so i am taking a mental health break from social media. see y'all soon. thank you for the love and support. no hate to my parents please."

In her statement, Kellyanne Conway said, "It will be less drama, more mama."

Conway is one of the last remaining Trump staffers from the 2016 campaign. She was the first woman to manage a winning presidential campaign, leading Trump's effort in the final months. She began the 2016 cycle advising Texas Sen. Ted Cruz, Trump's biggest primary rival.

Her time in the White House was not without controversy. Two days after the inauguration, Conway coined the term "alternative facts" during an interview on NBC's Meet The Press.She was also cited for violating the law against political activity by government employees multiple times, and the government office investigating those activities recommended her dismissal in 2019.

Aside from being a staunch defender of the president, Conway also played a central role in the administration's efforts to combat the opioid crisis.

In her statement, Conway said her experience working at the White House had been "heady. It's been humbling."

"I am deeply grateful to the President for this honor, and to the First Lady, the Vice President and Mrs. Pence, my colleagues in the White House and the Administration, and the countless people who supported me and my work."

She said that she and her husband "disagree about plenty," but that the couple "are united on what matters most: the kids."

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