Marc Kasowitz, who represents the U.S. president in the ongoing case of election meddling, drew flak after his profanity-laden replies to an unnamed sender were made public on Wednesday. Their exchange of emails was first reported by ProPublica which refused to reveal the identity of the sender, who reportedly asked the lawyer to resign after he said that he is not planning to seek security clearance to access government confidential documents for the Russian case.

'No need for a security clearance'

Several lawyers argued that Kasowitz will have to pursue a high level security clearance in order to represent Donald Trump in the case of Russian interference during the 2016 Presidential Election.

Earlier reports confirmed that the lawyer was the legal adviser of POTUS before he was even elected to the presidency.

Reuters confirmed that the U.S. president personally chose the New York-based lawyer to handle his case regarding election meddling by Russia. After it was reported that Kasowitz does not have a security clearance for the investigation which requires certain classified materials, his spokesperson explained that the lawyer was not asked to seek a security clearance for the Russian probe. He even insisted that there is no need to have one and nor are they planning to secure the requisite for the case.

'You will see me, I promise'

After the news came out, Kasowitz received a message from an unknown sender who challenged him to resign from his role in the Russian probe.

The email stated that representing the U.S. president for the election hacking case will do him no good and will only make the lawyer "a disparaging historical footnote" to Trump's presidency.

Five minutes later, Kasowitz swore at the sender before he threatened to figure out his identity. "And you don't know me, but I will know you...

I'm on you now. You are f*cking with me now. Let's see who you are. Watch your back, b*tch," the lawyer replied.

Trump's lawyer even challenged the sender to call him and revealed that he already knows the residence of the sender. ProPublica confirmed that the sender is a former public relations officer who personally submitted reams of emails to the Federal Bureau of Investigation (FBI) to be examined.

Kasowitz later acknowledged his mistake and apologized for his profane emails. "This is one of those times where one wishes he could reverse the clock, but of course I can't," he said.