Michael Cohen, longtime personal attorney for President Donald Trump, on Monday showed up at U.S. District Court in lower Manhattan after skipping an initial Friday hearing.

Cohen is asking Judge Kimba Wood to bar prosecutors from getting the first look at client files seized from him by the FBI last week. A lawyer for the president, Joanna Hendon, on Sunday filed a motion asking the judge to grant the president the privilege of reviewing the documents first.

The hearings follow the April 9 raids, in which federal agents seized materials from Cohen's office, home, hotel room and electronic devices.

Both Cohen and Trump argue that they should be allowed to decide which of the documents should be permanently withheld because they are protected by attorney-client privilege.

U.S. attorneys pushed back against Cohen's request in a filing Friday, saying that "Cohen is in fact performing little to no legal work," and alleging that "zero" emails were exchanged between Cohen and Trump. Their assessment was based on already conducted searches of Cohen's email accounts which had not been reported before the court filing.

In a Monday court filing, lawyers for Cohen said that he represented three clients between 2017 and 2018, but refused to identify one of them. The anonymous client had told Cohen not to disclose his name, his lawyers said, partly because it would likely "be embarrassing or detrimental" to him.

The other two clients are Trump and Elliott Broidy, a former deputy finance chairman for the Republican National Committee who resigned following reports that he had impregnated a Playboy model in an extramarital affair.

Cohen was paid $250,000 to negotiate a $1.6 million payoff deal to the woman.