Trump faces a $250 million lawsuit over alleged fraud in New York.
The trial involves Trump, his sons, and Trump Organization executives.
Trump denies wrongdoing, calls it a "witch hunt."
Attorney General Letitia James accuses Trump of inflating net worth and lowering taxes.
Security is tight for the trial; opening statements start at 10 a.m.
Judge found Trump overvalued assets by billions in a pretrial hearing.
Trial could affect Trump's fortune and real estate empire.
Democrats accused of using the case for political motives.
Trump says he'll attend the trial's opening.
Attorney General Letitia James seeks justice in the case.