CNN anchor Anderson Cooper's Wednesday tweet labeling President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate 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 Strange Luther Johnson StrangeSessions hits back at Trump days ahead of Alabama Senate runoff The biggest political upsets of the decade State 'certificate of need' laws need to go 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.