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7 year oldPresident Donald Trump said Mr Pruitt had done "an outstanding job, and I will always be thankful to him".
But Mr Pruitt has been embroiled in allegations of ethics violations for months.
His deputy Andrew Wheeler will take over as acting head of the agency, Mr Trump said.
The long list of Scott Pruitt controversiesNewer articles
<p>Russia carried out a "massive" overnight attack on central and southeastern Ukraine, hitting Zaporizhzhia, Dnipropetrovsk and other regions. At least one person was killed and...