Cole Tomas Allen, the man accused of attempting to assassinate President Donald Trump at the White House Correspondents' Association Dinner, pleaded not guilty to all charges during a federal court arraignment on Monday.

Allen, 31, did not speak during the proceeding as his public defender, Tezira Abe, entered the plea on his behalf. He appeared in court wearing shackles around his wrists.

The suspect faces four federal charges stemming from the April 25 shooting at the White House Correspondents' Association Dinner in Washington. The charges include attempting to assassinate President Trump, assaulting a federal officer with a deadly weapon, and two firearms-related counts.

The incident occurred at the annual gala, which brings together journalists, politicians, and other public figures. Allen is accused of opening fire during the event in what authorities have characterized as an assassination attempt against the president.

Allen remains in federal custody as the case proceeds through the court system. The shooting marked a significant security breach at one of Washington's most high-profile annual events.