White House adviser Kellyanne Conway has announced she is leaving the role at the end of August.
The 53-year-old said she was leaving to focus on her family, adding: “This is completely my choice and my voice.
“In time, I will announce future plans.
“For now, and for my beloved children, it will be less drama, more mama.”
She said her husband George, a lawyer and well-known critic of Donald Trump, would also be “making changes”.
“We disagree about plenty but we are united on what matters most: the kids.”
The couple have four children in middle school and high school and Mrs Conway said: “As millions of parents nationwide know, kids ‘doing school from home’ requires a level of attention and vigilance that is as unusual as these times”.
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She was a regular spokeswoman for Donald Trump during his presidential campaign, when she loyally sold his vision to the public.
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She worked for years as a Republican pollster and originally backed Senator Ted Cruz in the 2016 Republican primary.
But she moved to the Trump campaign, becoming the first woman to successfully steer a White House bid.
After Mr Trump won the election, she became senior counsellor to the president but she has been less visible this year, following a number of gaffes.
In 2017, she was criticised after blaming two Iraqis for a “massacre” that never happened.
She had said: “I bet it’s brand new information to people that President Obama had a six-month ban on the Iraqi refugee programme after two Iraqis came here to this country, were radicalised and they were the masterminds behind the Bowling Green massacre.
“Most people don’t know that because it didn’t get covered.”
Mrs Conway later said she had made an “honest mistake”.
She was reprimanded by the government ethics office for promoting Ivanka Trump’s clothing line during a live television interview from the White House in February 2017.
The same month, she was criticised after being photographed kneeling on a sofa in the Oval Office.
Her determination to defend false White House statements about inauguration crowd sizes led to her using the now-famous phrase “alternative facts”.