Sens. Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-S.C.) and Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) on Thursday will testify as character witnesses for Sen. Robert Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.) in his federal corruption trial.

Graham will appear in Newark, N.J., where the trial is being held in a federal district court, his office said in a statement. CNN reported that Booker will also testify at the trial.

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“Graham is testifying as a character witness for the defense and traveled to the trial at his own personal expense,” Graham’s office said.

“He will testify about his service with Senator Menendez in the Senate. Graham’s testimony is unrelated to the underlying charges.”

The lawmakers' impending testimonies for their colleague come as Menendez endures an ongoing trial, in which he has pleaded not guilty to allegations that he accepted campaign donations and free trips from his co-defendant in exchange for political favors.