CNN: Anderson Cooper's Trump tweet result of someone stealing phone
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CNN anchor Anderson Cooper's Wednesday tweet labeling President TrumpDonald John TrumpNASA exec leading moon mission quits weeks after appointment The Hill's Morning Report — After contentious week, Trump heads for Japan Frustration boils over with Senate's 'legislative graveyard' MORE a "pathetic loser" was the result of someone taking his assistant's phone, according to the network.

A person stole the smartphone belonging to Cooper's assistant, the only other person with access to the anchor's Twitter account, after he "left his phone unlocked and unattended at the gym early this morning," a CNN spokesperson told The Hill.

"Geolocation tools confirm that the tweet in question was not sent from Anderson Cooper’s phone. Anderson was in Washington, and we have proof the tweet was sent from New York, from a phone belonging to his assistant," read the statement.

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"Oh Really? You endorsed him you tool! Pathetic loser," read the tweet, which has since been deleted, posted on Cooper's account Wednesday as a response to a tweet from Trump. Trump on Wednesday tweeted that he had originally endorsed failed Senate candidate Roy Moore's GOP primary opponent Sen. Luther StrangeLuther Johnson StrangeDon't import prescription drugs Roy Moore 'seriously considering' another Senate bid GOP leaders dead set against Roy Moore in Alabama MORE (Ala.).

Cooper tweeted from his account Wednesday morning that he had "not sent a tweet in days" and that CNN was investigating the incident. 

The assistant whose phone was stolen has "worked with Anderson for more than a decade," CNN said.