He met Russian Foreign Minister Sergei Lavrov in the Oval Office last week.
US media said Mr Trump had shared material that was passed on by a partner which had not given permission.
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Trump defends 'right' to share secrets
16 May 2017
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President Donald Trump has defended his "absolute right" to share information with Russia, following a row over classified material.
Mr Trump tweeted that he had shared "facts pertaining to terrorism and airline safety" and wanted Russia to do more against so-called Islamic State.
He met Russian Foreign Minister Sergei Lavrov in the Oval Office last week.
US media said Mr Trump had shared material that was passed on by a partner which had not given permission.
He met Russian Foreign Minister Sergei Lavrov in the Oval Office last week.
US media said Mr Trump had shared material that was passed on by a partner which had not given permission.
