"The Donald J Trump Campaign for President, which has set a historic record in the Republican Primary having received almost 14 million votes, has today announced that Corey Lewandowski will no longer be working with the campaign," Trump campaign spokeswoman Hope Hicks said in a statement to The New York Times.
"The campaign is grateful to Corey for his hard work and dedication and we wish him the best in the future," Hicks said.
According to the top US daily, Lewandowski, 42, was seen as someone having hostile relationship with members of the national press.
In an interview to Fox News, Barry Bennett, a senior Trump adviser, said, "Paul [Manafort] is totally in charge" of the campaign now that Lewandowski is gone.
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"Lewandowki's abrupt departure is the campaign's most significant staff change to date, and signals an acknowledgment from Trump and his inner circle that big change is necessary ahead of the general election," CNN commented on the 70-year-old real estate billionaire's surprise move.
The decision to fire Lewandowski was made swiftly in a Monday morning weekly meeting with Trump's family members. A combination of falling poll numbers and pressure from many in Trump's inner circle ultimately led to the decision, a Trump adviser said.